| Net Income | 236.51 | 226.23 | 204.99 | 184.68 | 260.34 | 257.2 | |
| Depreciation & Amortization | 38.23 | 36.55 | 31.97 | 31.18 | 30.41 | 29.65 | |
| Stock-Based Compensation | 13.86 | 14.23 | 13.2 | 12.64 | 11.53 | 10.66 | |
| Provision & Write-off of Bad Debts | - | - | - | - | -5 | - | |
| Other Operating Activities | 2.31 | 1.06 | -0.04 | 1.25 | 6.35 | 3.71 | |
| Change in Accounts Receivable | 1.76 | -4.14 | -1.4 | -7.35 | -2.86 | -13.25 | |
| Change in Accounts Payable | 2.07 | 9.66 | -3.11 | -3.89 | 7.39 | 1.01 | |
| Change in Unearned Revenue | 6.93 | - | - | -0.01 | 0.01 | -0.02 | |
| Change in Income Taxes | -1.14 | -0.87 | -0.45 | 4.76 | 0.51 | -0.28 | |
| Change in Other Net Operating Assets | -2.46 | 7.22 | -1.51 | -2.43 | 4.44 | 20.14 | |
| Operating Cash Flow | 298.07 | 289.96 | 243.66 | 220.82 | 313.12 | 308.82 | |
| Operating Cash Flow Growth | 10.37% | 19.00% | 10.35% | -29.48% | 1.39% | 0.81% | |
| Capital Expenditures | -36.88 | -37.25 | -44.54 | -35.23 | -218.88 | -104.42 | |
| Sale (Purchase) of Intangibles | -0.27 | -0.41 | -0.9 | -0.4 | -0.52 | -0.52 | |
| Investment in Securities | -80.75 | 99.03 | -35.04 | -61.51 | 10.46 | 10.59 | |
| Other Investing Activities | 0.5 | - | - | - | 1,160 | 75 | |
| Investing Cash Flow | -117.39 | 61.37 | -80.47 | -97.14 | 950.98 | -19.35 | |
| Long-Term Debt Repaid | - | - | - | - | -107.77 | -33.14 | |
| Net Debt Issued (Repaid) | - | - | - | - | -107.77 | -33.14 | |
| Issuance of Common Stock | - | - | - | - | 2.68 | 0.88 | |
| Repurchase of Common Stock | -229.72 | -173.18 | -137.12 | -604.21 | -803.83 | -134.01 | |
| Financing Cash Flow | -229.72 | -173.18 | -137.12 | -604.21 | -908.93 | -166.28 | |
| Net Cash Flow | -49.04 | 178.15 | 26.07 | -480.53 | 355.17 | 123.2 | |
| Free Cash Flow | 261.2 | 252.71 | 199.13 | 185.59 | 94.24 | 204.41 | |
| Free Cash Flow Growth | 15.99% | 26.91% | 7.29% | 96.92% | -53.89% | 79.09% | |
| Free Cash Flow Margin | 24.46% | 24.46% | 20.72% | 20.36% | 10.51% | 24.22% | |
| Free Cash Flow Per Share | 9.11 | 8.63 | 6.61 | 5.76 | 2.14 | 4.33 | |
| Cash Interest Paid | - | 0 | 0.03 | 0 | 3.7 | 4.31 | |
| Cash Income Tax Paid | 65.52 | 65.26 | 59.03 | 48.57 | 61.9 | 68.38 | |
| Levered Free Cash Flow | 205.5 | 196.16 | 149.01 | 145.7 | 6.03 | 112.54 | |
| Unlevered Free Cash Flow | 205.5 | 196.17 | 149.03 | 145.7 | 8.28 | 115.29 | |
| Change in Working Capital | 7.16 | 11.88 | -6.46 | -8.93 | 9.49 | 7.61 | |