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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 26, 2021 | Mar. 31, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jul. 20, 2021
Share Repurchase Plan |  |  |  |  |  |  |  |  |  |  |
Value of shares authorized by the Board of Directors to be repurchased under share repurchase plan |  |  |  |  |  |  |  |  |  |  | $ 1,000.0
Share repurchases (in shares) |  |  | 885,606 |  |  | 2,466 |  |  | 1,000,000.0 | 3,300,000 |
Average costs per share |  |  | $ 147.89 |  |  | $ 100.00 |  |  | $ 150.12 | $ 90.10 |
Value of shares repurchased |  |  | $ 131.0 | $ 24.0 |  | $ 0.2 |  | $ 300.0 | $ 155.0 | $ 300.2 |
Dividends |  |  |  |  |  |  |  |  |  |  |
Common stock quarterly dividend per share (in dollars per share) | $ 0.6875 |  | $ 0.6875 | $ 0.6875 | $ 0.6875 | $ 0.625 | $ 0.625 | $ 0.625 |  |  |
Common stock dividend quarterly declared and paid per share (in dollars per share) |  |  | $ 0.6875 |  |  | $ 0.6250 |  |  | $ 2.0625 | $ 1.8750 |
Dividends paid |  |  | $ 43.6 |  |  | $ 39.8 |  |  | $ 131.2 | $ 120.7 |
Common Stock and Additional Paid in Capital |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |  |  |  |
Value of shares repurchased |  |  | $ 21.9 | $ 24.0 |  | $ 0.2 |  | $ 119.3 |  |  |
Common Stock and Additional Paid-In (in Shares) |  |  |  |  |  |  |  |  |  |  |
Payments made to tax authorities on employees' behalf |  |  |  |  |  |  |  |  | 9.2 | 14.9 |
RSU's |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |
Dividend equivalents paid |  |  |  |  |  |  |  |  | $ 1.1 | $ 2.1 |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  |  |  |  |  |  |  | 3 years |  |
RSU's | Service-based |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  | 3 years |  |  |  |  |  |  |  |  |
Changes |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 191,139 |  |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 141.41 |  |  |  |  |  |  |  |  |
RSU's | Performance-based |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  | 3 years |  |  |  |  |  |  |  |  |
Changes |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 127,356 |  |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) |  | $ 141.41 |  |  |  |  |  |  |  |  |
Unvested RSUs |  |  |  |  |  |  |  |  |  |  |
Changes |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in shares) |  |  |  |  | 995,720 |  |  |  | 995,720 |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 318,495 |  |
Vested (in shares) |  |  |  |  |  |  |  |  | (7,812) |  |
Cancelled or forfeited (in shares) |  |  |  |  |  |  |  |  | (19,107) |  |
Unvested at the end of the period (in shares) |  |  | 1,287,296 |  |  |  |  |  | 1,287,296 |  |
Shares reserved for future grants (all plans) |  |  | 1,877,393 |  |  |  |  |  | 1,877,393 |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) |  |  |  |  | $ 85.27 |  |  |  | $ 85.27 |  |
Granted (in dollars per share) |  |  |  |  |  |  |  |  | 141.41 |  |
Vested (in dollars per share) |  |  |  |  |  |  |  |  | 86.52 |  |
Cancelled or forfeited (in dollars per share) |  |  |  |  |  |  |  |  | 89.99 |  |
Unvested at the end of the period (in dollars per share) |  |  | $ 99.08 |  |  |  |  |  | $ 99.08 |  |

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