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Equity - Share Repurchases, Dividends, Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Millions |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
Apr. 20, 2021 | Oct. 23, 2018 | Mar. 31, 2021 | Mar. 31, 2021 | Mar. 31, 2020
Share Repurchase Plan |  |  |  |  |
Increase in authorized number of shares to be repurchased |  | 5,000,000.0 |  |  |
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan |  |  | 2,800,000 | 2,800,000 |
Number of shares authorized by the Board of Directors to be repurchased under share repurchase plan, expressed as a percentage of outstanding shares (as a percent) |  |  | 4.00% | 4.00% |
Share repurchases (in shares) |  |  |  | 0 | 3,300,000
Average costs per share |  |  |  |  | $ 90.09
Value of shares repurchased |  |  |  |  | $ 300.0
Dividends |  |  |  |  |
Common stock quarterly dividend per share (in dollars per share) | $ 0.6875 |  |  | $ 0.6875 | $ 0.625
Common stock dividend quarterly declared and paid per share (in dollars per share) |  |  |  | $ 0.6875 | $ 0.625
Dividends paid |  |  |  | $ 43.8 | $ 41.0
Common Stock and Additional Paid in Capital |  |  |  |  |
Share Repurchase Plan |  |  |  |  |
Value of shares repurchased |  |  |  |  | 119.3
Common Stock and Additional Paid-In (in Shares) |  |  |  |  |
Payments made to tax authorities on employees' behalf |  |  |  | 8.2 | 5.1
RSU's |  |  |  |  |
Dividends |  |  |  |  |
Dividend equivalents paid |  |  |  | $ 1.0 | $ 0.9
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 |
Granted (in shares) |  |  |  | 318,495 |
Vested (in shares) |  |  |  | (4,917) |
Cancelled or forfeited (in shares) |  |  |  | (8,855) |
Unvested at the end of the period (in shares) |  |  | 1,300,443 | 1,300,443 |
Shares reserved for future grants (all plans) |  |  | 1,866,667 | 1,866,667 |
Weighted Average Grant Date Fair Value |  |  |  |  |
Unvested at the beginning of the year (in dollars per share) |  |  |  | $ 85.27 |
Granted (in dollars per share) |  |  |  | 141.41 |
Vested (in dollars per share) |  |  |  | 86.53 |
Cancelled or forfeited (in dollars per share) |  |  |  | 85.00 |
Unvested at the end of the period (in dollars per share) |  |  | $ 99.02 | $ 99.02 |

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