| Net Income | 175.78 | 181.28 | 197.92 | 161.52 | 164.97 | 75.03 | |
| Depreciation & Amortization | 0.74 | 0.73 | 0.62 | 0.68 | 0.52 | 0.42 | |
| Loss (Gain) From Sale of Investments | 0.14 | 0.17 | - | 0.07 | 0.18 | 0.01 | |
| Stock-Based Compensation | 15.1 | 16.57 | 23.6 | 24.45 | 11.96 | 12.85 | |
| Provision & Write-off of Bad Debts | 0.29 | 0.57 | 1.02 | 0.45 | 0.52 | 0.44 | |
| Other Operating Activities | -55.46 | -59.58 | -4.9 | -1.13 | 0.56 | 1.1 | |
| Change in Accounts Receivable | 1.19 | 5.95 | -16.08 | -10.42 | -10.54 | -4.42 | |
| Change in Inventory | -12.18 | -14.45 | -5.2 | -18.87 | -6.04 | -5.58 | |
| Change in Accounts Payable | 1.83 | -0.18 | -2.28 | 7.46 | 2.37 | 2.71 | |
| Change in Unearned Revenue | -4.7 | 5.4 | -3.07 | 1.2 | 2.67 | -5.51 | |
| Change in Other Net Operating Assets | -0.13 | -3.78 | -14.81 | 16.15 | 7.74 | 2.18 | |
| Operating Cash Flow | 122.59 | 132.66 | 176.83 | 181.58 | 174.89 | 79.23 | |
| Operating Cash Flow Growth | -31.83% | -24.98% | -2.62% | 3.83% | 120.74% | 27.36% | |
| Capital Expenditures | -0.64 | -0.67 | -0.71 | -1.58 | -0.94 | -0.46 | |
| Investment in Securities | 285.72 | 162.88 | -135.36 | -107.9 | -159.17 | -42.84 | |
| Investing Cash Flow | 285.08 | 162.21 | -136.06 | -109.47 | -160.11 | -43.31 | |
| Issuance of Common Stock | 2.87 | 2.61 | 5.5 | 1.55 | 20.34 | 4.78 | |
| Repurchase of Common Stock | -385.35 | -285.39 | - | -42.64 | -35.37 | -17.22 | |
| Financing Cash Flow | -382.47 | -282.77 | 5.5 | -41.09 | -15.02 | -12.44 | |
| Foreign Exchange Rate Adjustments | -0.19 | -1.18 | 0.61 | -1.62 | -0.56 | 0.73 | |
| Net Cash Flow | 25.02 | 10.92 | 46.87 | 29.4 | -0.8 | 24.21 | |
| Free Cash Flow | 121.95 | 132 | 176.12 | 180 | 173.95 | 78.76 | |
| Free Cash Flow Growth | -32.00% | -25.05% | -2.16% | 3.48% | 120.85% | 28.04% | |
| Free Cash Flow Margin | 31.08% | 33.43% | 35.79% | 39.63% | 48.65% | 38.21% | |
| Free Cash Flow Per Share | 1.59 | 1.64 | 2.05 | 2.11 | 2.02 | 0.94 | |
| Cash Income Tax Paid | 17.69 | 17.69 | 31.61 | 25.84 | 1.66 | 0.22 | |
| Levered Free Cash Flow | 73.58 | 78.31 | 105.23 | 149.35 | 107.56 | 51.44 | |
| Unlevered Free Cash Flow | 73.58 | 78.31 | 105.23 | 149.35 | 107.56 | 51.44 | |
| Change in Net Working Capital | 10.41 | 8.65 | 40.57 | -2.14 | 8.65 | 6.88 | |