| Fiscal period | 2025 | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 |
| Period End Date | 12/31/2025 | 12/31/2024 | 12/31/2023 | 12/31/2022 | 12/31/2021 | 12/31/2020 | 12/31/2019 | 12/31/2018 | 12/31/2017 | 12/31/2016 |
| Revenue:Services | 503.04 | 525.52 | 487.87 | 394.10 | 334.80 | 303.57 | 360.52 | 329.69 | 326.50 | 467.29 |
| Revenue:Hardware and other | 25.42 | 26.24 | 24.10 | 29.48 | 23.74 | 16.94 | 12.52 | 13.97 | 43.19 | 52.28 |
| Revenue:Recovery relating to bankrupt customer | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Revenue:Software License | 14.82 | 15.09 | 18.21 | 24.85 | 37.07 | 38.28 | 48.86 | 45.37 | 72.31 | 85.00 |
| Revenue:Cloud subscriptions | 408.14 | 337.20 | 254.61 | 176.46 | 122.20 | 79.83 | 46.83 | 23.10 | 9.60 | -- |
| Allowance for bankrupt customer | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Maintenance | 129.97 | 138.30 | 143.94 | 142.20 | 145.84 | 147.75 | 149.23 | 147.03 | 143.00 | -- |
| Total Revenues | 1,081.39 | 1,042.35 | 928.73 | 767.08 | 663.64 | 586.37 | 617.95 | 559.16 | 594.60 | 604.56 |
| Cost of Services | -- | -- | -- | -- | -- | -- | -- | -- | -- | 197.48 |
| Cost of software license | 0.93 | 1.32 | 1.35 | 2.13 | 2.31 | 2.89 | 2.63 | 5.30 | -- | -- |
| Cost of hardware and other | -- | -- | -- | -- | -- | -- | -- | -- | 32.21 | 41.58 |
| Cost of license | -- | -- | -- | -- | -- | -- | -- | -- | 5.48 | 10.82 |
| Cost of cloud subscriptions, maintenance and services | 471.41 | 469.66 | 429.26 | 356.11 | 295.52 | 266.99 | 282.34 | 235.58 | 208.05 | -- |
| Depreciation and amortization | 6.32 | 6.30 | 5.75 | 6.66 | 7.91 | 8.95 | 7.99 | 8.61 | 9.06 | 9.09 |
| Amortization of acquisition-related intangibles | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Amortization of acquired developed technology | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Research and development | 145.06 | 137.69 | 126.81 | 111.88 | 97.63 | 84.28 | 87.61 | 71.90 | 57.70 | 54.74 |
| In-process research and development and other acquisition-related charges | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| General and Administrative | 93.76 | 89.81 | 81.17 | 73.07 | 68.09 | 61.44 | 64.60 | 52.62 | 46.05 | 48.32 |
| Sales and marketing | 81.18 | 75.98 | 74.49 | 64.54 | 57.86 | 47.76 | 56.86 | 51.26 | 47.48 | 48.22 |
| Restructuring charge | 2.94 | -- | -- | -- | -- | -- | -- | -- | 2.92 | -- |
| Asset impairment charge | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Settlement and accounts receivable charges | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Severance, restructuring, acquisition, and accounts receivable charges | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Recovery of previously impaired investment | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Total Operating Expenses | 801.59 | 780.76 | 718.84 | 614.38 | 529.31 | 472.31 | 502.03 | 425.27 | 408.95 | 410.25 |
| Operating Income / (Loss) | 279.80 | 261.60 | 209.88 | 152.70 | 134.33 | 114.06 | 115.92 | 133.89 | 185.65 | 194.31 |
| Interest expense | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Interest income | 4.39 | 6.03 | 5.30 | 0.60 | 0.07 | 0.10 | 0.72 | 1.07 | 1.17 | 1.16 |
| Other income (loss), net | 1.71 | (0.81) | (1.51) | 4.83 | (0.33) | (0.38) | (0.56) | 1.28 | (1.99) | 0.64 |
| Income (loss) before income taxes | 285.89 | 266.81 | 213.67 | 158.12 | 134.07 | 113.78 | 116.08 | 136.23 | 184.83 | 196.11 |
| Current-State | 11.32 | 12.63 | 10.91 | 11.18 | 5.19 | 4.79 | 5.71 | 6.18 | 6.60 | 8.20 |
| Current- Foreign | 7.55 | 9.75 | 8.54 | 5.49 | 6.31 | 6.85 | 7.32 | 7.02 | 6.19 | 5.82 |
| Deferred- Foreign | (1.11) | (1.12) | (2.60) | (2.13) | (0.98) | 0.32 | (0.21) | (0.46) | (0.05) | (0.02) |
| Deferred:Federal | 16.57 | (23.78) | (23.12) | (22.38) | (0.43) | (0.39) | (0.86) | (3.13) | 1.59 | 2.09 |
| Deferred:State | 2.88 | (3.80) | (3.13) | (5.20) | (0.53) | 1.11 | (0.33) | (0.67) | 0.04 | (0.27) |
| Income tax (benefit) provision | 65.95 | 48.45 | 37.10 | 29.16 | 23.60 | 26.54 | 30.32 | 31.54 | 68.35 | 71.87 |
| Current-Federal | 28.73 | 54.76 | 46.50 | 42.20 | 14.04 | 13.86 | 18.68 | 22.61 | 54.00 | 56.05 |
| Net Income (Loss) Available to Common Shareholders | 219.95 | 218.36 | 176.57 | 128.96 | 110.47 | 87.24 | 85.76 | 104.69 | 116.48 | 124.23 |
| Net Earnings Per Share (Basic) | 3.64 | 3.56 | 2.86 | 2.05 | 1.74 | 1.37 | 1.33 | 1.58 | 1.68 | 1.73 |
| Net Earnings Per Share (Diluted) | 3.60 | 3.51 | 2.82 | 2.03 | 1.72 | 1.36 | 1.32 | 1.58 | 1.68 | 1.72 |
| Weighted Average Shares Outstanding (Basic) | 60.47 | 61.30 | 61.82 | 62.77 | 63.45 | 63.54 | 64.40 | 66.20 | 69.18 | 71.67 |
| Weighted Average Shares Outstanding (Diluted) | 61.05 | 62.18 | 62.61 | 63.41 | 64.32 | 64.33 | 65.10 | 66.43 | 69.42 | 72.06 |