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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. 22, 2019 | Oct. 23, 2018 | Mar. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2019 | Sep. 30, 2018
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 |  |  |  | 6,400,000 |  |  |  |  |  | 6,400,000 |
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) |  |  |  | 10.00% |  |  |  |  |  | 10.00% |
Value of shares repurchased |  |  |  |  | $ 50.0 |  | $ 80.1 | $ 0.7 | $ 49.3 | $ 50.0 |
Value of shares repurchased |  |  |  |  |  |  |  |  |  |  | $ 130.7
Value of shares repurchased pending settlement |  |  |  |  |  |  |  |  |  |  | $ 0.6
Dividends |  |  |  |  |  |  |  |  |  |  |
Common stock quarterly dividend per share (in dollars per share) | $ 0.55 |  |  | $ 0.55 | $ 0.55 | $ 0.55 | $ 0.50 | $ 0.50 | $ 0.50 |  |
Common stock dividend quarterly declared and paid per share (in dollars per share) |  |  |  | $ 0.55 |  |  | $ 0.50 |  |  | $ 1.65 | $ 1.50
Dividends paid |  |  |  | $ 36.7 |  |  | $ 35.9 |  |  | $ 110.6 | $ 108.5
Common Stock and Additional Paid in Capital |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Plan |  |  |  |  |  |  |  |  |  |  |
Value of shares repurchased |  |  |  |  | $ 50.0 |  | $ 80.1 | $ 0.7 | $ 49.3 |  |
Common Stock and Additional Paid-In (in Shares) |  |  |  |  |  |  |  |  |  |  |
Payments made to tax authorities on employees' behalf |  |  |  |  |  |  |  |  |  | 9.6 | 5.5
RSU's |  |  |  |  |  |  |  |  |  |  |
Dividends |  |  |  |  |  |  |  |  |  |  |
Dividend equivalents paid |  |  |  |  |  |  |  |  |  | $ 2.7 | $ 2.0
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) |  |  | 294,190 |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per shares) |  |  | $ 88.05 |  |  |  |  |  |  |  |
RSU's | Performance-based |  |  |  |  |  |  |  |  |  |  |
Stock-Based Compensation |  |  |  |  |  |  |  |  |  |  |
Vesting period (in years) |  |  | 3 years |  |  |  |  |  |  |  |
Changes |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 194,155 |  |  |  |  |  |  |  |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |
Granted (in dollars per shares) |  |  | $ 88.05 |  |  |  |  |  |  |  |
Unvested RSUs |  |  |  |  |  |  |  |  |  |  |
Changes |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in shares) |  |  |  |  |  | 889,830 |  |  |  | 889,830 |
Granted (in shares) |  |  |  |  |  |  |  |  |  | 488,345 |
Vested (in shares) |  |  |  |  |  |  |  |  |  | (3,837) |
Cancelled or forfeited (in shares) |  |  |  |  |  |  |  |  |  | (10,318) |
Unvested at the end of the period (in shares) |  |  |  | 1,364,020 |  |  |  |  |  | 1,364,020 |
Shares reserved for future grants (all plans) |  |  |  | 1,037,999 |  |  |  |  |  | 1,037,999 |
Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |
Unvested at the beginning of the period (in dollars per share) |  |  |  |  |  | $ 82.05 |  |  |  | $ 82.05 |
Granted (in dollars per shares) |  |  |  |  |  |  |  |  |  | 88.05 |
Vested (in dollars per shares) |  |  |  |  |  |  |  |  |  | 82.05 |
Cancelled or forfeited (in dollars per shares) |  |  |  |  |  |  |  |  |  | 82.99 |
Unvested at the end of the period (in dollars per shares) |  |  |  | $ 84.19 |  |  |  |  |  | $ 84.19 |

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