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Stock-Based Compensation - Narrative (Details) $ in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jun. 24, 2020 | May 09, 2019 shares | May 31, 2017 day | Dec. 31, 2020 USD ($) award shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of shares authorized (in shares) | shares |  | 3,700,000 |  |  |  |
Share-based compensation arrangement by share-based payment award, number of additional shares authorized (in shares) | shares |  | 1,500,000 |  |  |  |
Number of stock-based compensation plans | award |  |  |  | 4 |  |
Total stock-based compensation cost recognized |  |  |  | $ 63.9 | $ 45.6 | $ 33.9
Total unrecognized compensation cost |  |  |  | 5.5 |  |
Tax benefit from stock option and restricted stock units |  |  |  | 11.5 | 9.9 | 8.0
Vesting period | 1 year |  |  |  |  |
Shares exercised, total intrinsic value |  |  |  | 8.7 | 5.7 | 1.9
Restricted Stock Units (RSUs) |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  | $ 42.2 |  |
Compensation cost expected recognition weighted average period (in years) |  |  |  | 1 year 2 months 12 days |  |
Shares granted fair value |  |  |  | $ 37.0 | 34.0 | 16.8
Shares vested fair value |  |  |  | $ 11.9 | $ 7.6 | 9.2
Deferred stock units (in shares) | shares |  |  |  | 472,000 | 260,000 |
Restricted Stock Units (RSUs) | Non-Employee Directors |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 12 months |  |
Restricted Stock Units (RSUs) | Certain Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 3 years |  |
Performance Based Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted fair value |  |  |  | $ 58.5 | $ 19.0 | 18.3
Shares vested fair value |  |  |  | $ 21.7 | $ 9.3 | 12.0
Deferred stock units (in shares) | shares |  |  |  | 582,000 | 449,000 |
Performance Based Restricted Stock Units | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance goals tracking period |  |  |  | 1 year |  |
Performance Based Restricted Stock Units | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Performance goals tracking period |  |  |  | 3 years |  |
TSR |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  | $ 74.1 |  |
Compensation cost expected recognition weighted average period (in years) |  |  |  | 2 years |  |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Expiration period |  |  | 10 years |  |  |
Number of consecutive trading days | day |  |  | 20 |  |  |
Award vesting rights |  |  | 75.00% |  |  |
Share-based compensation granted |  |  | 5 years |  |  |
Share-based compensation nonvested |  |  | 25.00% |  |  |
Derived service period |  |  |  | 3 years |  |
Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Total unrecognized compensation cost |  |  |  | $ 9.6 |  |
Vesting period |  |  |  | 3 years |  |
Compensation cost expected recognition weighted average period (in years) |  |  |  | 1 year 1 month 6 days |  |
Expiration period |  |  |  | 10 years |  |
Grant date fair value of shares |  |  |  | $ 9.3 | $ 7.2 | $ 5.2
Stock Option | First anniversary |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights |  |  |  | 33.00% |  |
Stock Option | Second anniversary |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights |  |  |  | 33.00% |  |
Stock Option | Third anniversary |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights |  |  |  | 33.00% |  |
Deferred Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  |  |  | 200 days |  |
Deferred stock units (in shares) | shares |  |  |  | 54,000 | 63,000 |
Common Stock Issued |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Units of common stock available for grant (in shares) | shares |  |  |  | 3,600,000 |  |

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