| Net Income | 181.48 | 173.68 | 151.6 | 107.99 | 70.96 | 91.57 | |
| Depreciation & Amortization | 17.45 | 18.51 | 26.99 | 34.62 | 35.9 | 32.85 | |
| Loss (Gain) From Sale of Assets | - | - | - | 0.01 | 0.01 | 0.11 | |
| Asset Writedown & Restructuring Costs | - | - | - | - | 0.63 | - | |
| Loss (Gain) From Sale of Investments | -5.93 | -6.74 | -5.18 | 0.83 | 3.87 | 0.83 | |
| Stock-Based Compensation | 76.92 | 77.13 | 69.08 | 53.41 | 67.58 | 40.04 | |
| Provision & Write-off of Bad Debts | 0.78 | 0.76 | 0.55 | 0.59 | 0.4 | 0.49 | |
| Other Operating Activities | -19.71 | -19.47 | -16.64 | -20.25 | -9.72 | 3.51 | |
| Change in Accounts Receivable | -6.71 | -19.09 | -24.98 | -13.39 | -9.22 | -22.63 | |
| Change in Accounts Payable | 0.49 | 0.22 | -1.58 | 2.11 | -0.03 | -0.39 | |
| Change in Unearned Revenue | 25.46 | 30.78 | 47.72 | 25.19 | 46.59 | 30.93 | |
| Change in Other Net Operating Assets | -2.05 | -11.71 | -2.96 | 7.75 | -6.34 | 2.8 | |
| Operating Cash Flow | 268.18 | 244.09 | 244.61 | 198.85 | 200.62 | 180.09 | |
| Operating Cash Flow Growth | 1.85% | -0.21% | 23.01% | -0.88% | 11.40% | 12.13% | |
| Capital Expenditures | -12.32 | -12.33 | -8.79 | -15.36 | -24.42 | -30.04 | |
| Sale of Property, Plant & Equipment | - | - | - | - | 0.01 | 0.42 | |
| Sale (Purchase) of Intangibles | - | - | - | -8.62 | -1.23 | -1.5 | |
| Investment in Securities | -74.21 | -59.09 | -64.38 | 169.05 | -4.51 | -49.81 | |
| Other Investing Activities | - | - | - | - | 0.63 | - | |
| Investing Cash Flow | -86.53 | -71.43 | -73.17 | 145.07 | -29.53 | -80.93 | |
| Long-Term Debt Repaid | - | - | - | - | -0.09 | -0.11 | |
| Net Debt Issued (Repaid) | - | - | - | - | -0.09 | -0.11 | |
| Issuance of Common Stock | 24.18 | 24.14 | 51.65 | 28.93 | 49.99 | 34.46 | |
| Repurchase of Common Stock | -188.94 | -169.79 | -193.15 | -334.96 | -157.79 | -146.93 | |
| Financing Cash Flow | -164.76 | -145.65 | -141.49 | -306.03 | -107.89 | -112.58 | |
| Net Cash Flow | 16.89 | 27.02 | 29.95 | 37.89 | 63.2 | -13.43 | |
| Free Cash Flow | 255.86 | 231.76 | 235.82 | 183.49 | 176.19 | 150.05 | |
| Free Cash Flow Growth | -0.25% | -1.72% | 28.52% | 4.14% | 17.42% | 12.79% | |
| Free Cash Flow Margin | 41.16% | 38.15% | 42.53% | 37.47% | 42.85% | 41.34% | |
| Free Cash Flow Per Share | 6.89 | 6.21 | 6.27 | 4.66 | 4.39 | 3.68 | |
| Cash Interest Paid | - | - | - | - | - | 0.01 | |
| Cash Income Tax Paid | 60.55 | 60.55 | 34.92 | 39.74 | 35.08 | 8.06 | |
| Levered Free Cash Flow | 234.11 | 211.8 | 205 | 182.2 | 202.81 | 107.53 | |
| Unlevered Free Cash Flow | 234.11 | 211.8 | 205 | 182.2 | 202.81 | 107.53 | |
| Change in Net Working Capital | -30.69 | -11.49 | -15.79 | -36.56 | -25.83 | -5.78 | |