| Fiscal period | 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 |
|---|
| Period End Date | 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 | 12/31/2015 |
|---|
| Customer Services | 3,388.71 | 3,073.28 | 2,695.82 | 2,424.30 | 2,161.22 | 2,015.48 | 1,821.57 | 1,673.96 | 1,573.48 | 1,485.31 |
| Total Revenues | 3,388.71 | 3,073.28 | 2,695.82 | 2,424.30 | 2,161.22 | 2,015.48 | 1,821.57 | 1,673.96 | 1,573.48 | 1,485.31 |
| Cost of Services Provided | 1,603.20 | 1,469.87 | 1,308.40 | 1,162.62 | 1,048.59 | 993.59 | 894.44 | 819.94 | 772.35 | 735.98 |
| Depreciation and amortization | 113.22 | 99.75 | 91.33 | 94.21 | 88.33 | 81.11 | 66.79 | 56.58 | 50.90 | 44.52 |
| Sales, general and administrative | 1,015.07 | 915.23 | 802.71 | 727.49 | 656.21 | 623.38 | 550.70 | 503.43 | 490.53 | 463.74 |
| Pension curtailment | -- | -- | -- | -- | -- | 49.90 | -- | -- | -- | -- |
| Restructuring Costs | 0.00 | 5.20 | -- | -- | -- | -- | -- | -- | -- | -- |
| Accelerated stock vesting expense | -- | -- | -- | -- | (6.69) | -- | -- | -- | -- | -- |
| Total Operating Expenses | 2,731.48 | 2,490.05 | 2,202.44 | 1,984.31 | -- | -- | -- | -- | -- | -- |
| Operating income | 657.22 | 583.23 | 493.39 | 439.99 | -- | -- | -- | -- | -- | -- |
| Interest expense | 27.68 | 19.06 | 2.64 | 0.83 | -- | -- | -- | -- | -- | -- |
| Gain on sales of assets | -- | -- | -- | -- | (1.60) | 0.58 | 0.88 | 0.24 | 0.78 | 1.95 |
| Interest income | -- | -- | -- | -- | (5.08) | (6.92) | 0.22 | 0.26 | 0.16 | 0.16 |
| Other (income) expense, net | 0.68 | 22.09 | 8.17 | 35.68 | -- | -- | -- | -- | -- | -- |
| Income (loss) before income taxes | 630.23 | 586.26 | 498.92 | 474.84 | 354.72 | 261.16 | 310.73 | 294.50 | 260.64 | 243.18 |
| Deferred | -- | -- | -- | -- | -- | -- | -- | -- | (3.25) | 3.49 |
| Current- Federal | -- | -- | -- | 87.89 | 67.86 | 43.59 | 49.91 | 76.18 | 69.10 | 68.67 |
| Current- State | -- | -- | -- | 24.13 | 18.38 | 15.34 | 13.60 | 13.41 | 12.95 | 11.34 |
| Current- Foreign | -- | -- | -- | 10.48 | 8.87 | 6.11 | 7.93 | 7.16 | 14.46 | 7.53 |
| Deferred- Federal | -- | -- | -- | (0.03) | (2.08) | (5.22) | 6.09 | 17.25 | (5.99) | 1.29 |
| Deferred- State | -- | -- | -- | 1.80 | 0.31 | (1.52) | 1.96 | 1.61 | 2.89 | 2.08 |
| Deferred- Foreign | -- | -- | -- | (0.11) | 0.55 | (0.49) | (0.42) | (0.22) | (0.15) | 0.13 |
| Current | -- | -- | -- | -- | -- | -- | -- | -- | 96.52 | 87.54 |
| Benefit from valuation allowance release | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Provision for Income Taxes | 163.85 | 151.30 | 130.32 | 124.15 | 93.90 | 57.81 | 79.07 | 115.38 | 93.27 | 91.03 |
| Income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative Effect of Change In Accounting Principle, Net of Taxes | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net Income (Loss) Available to Common Shareholders | 466.38 | 434.96 | 368.60 | 350.69 | 260.82 | 203.35 | 231.66 | 179.12 | 167.37 | 152.15 |
| Income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle- Basic | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income per share- Basic | 0.96 | 0.89 | 0.75 | 0.71 | 0.53 | 0.41 | 0.47 | 0.36 | 0.34 | 0.31 |
| Income before cumulative effect of change in accounting principle | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Cumulative effect of change in accounting principle- Diluted | -- | -- | -- | -- | -- | -- | -- | -- | -- | -- |
| Net income per share- Diluted | 0.96 | 0.89 | 0.75 | 0.71 | 0.53 | 0.41 | 0.47 | 0.36 | 0.34 | 0.31 |
| Weighted average shares outstanding - Basic | 484.25 | 489.95 | 492.30 | 492.05 | 491.60 | 491.22 | 490.94 | 490.47 | 491.05 | 491.81 |
| Weighted Average Shares Outstanding (Diluted) | 484.30 | 490.13 | 492.41 | 492.05 | 491.60 | 491.22 | 490.94 | 490.47 | 491.05 | 491.81 |