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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 16, 2019 | Apr. 17, 2019 | Nov. 09, 2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  |  | 2,526,858 | 146,516 | 11,815,748
Common stock awards reserved (in shares) |  |  |  |  | 145,202 |
Compensation expense | $ 39.0 | $ 22.3 | $ 40.1 |  |  |
Unrecognized compensation expense | $ 65.5 |  |  |  |  |
Unrecognized compensation expense, period of recognition | 1 year 10 months 24 days |  |  |  |  |
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Weighted average grant date fair value of performance shares granted (in dollars per share) | $ 129.40 | $ 134.65 | $ 168.86 |  |  |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Weighted average grant date fair value of performance shares granted (in dollars per share) | $ 147.53 | $ 124.48 | $ 179.40 |  |  |

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