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Stock-Based Compensation - Stock Option Plans (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Options granted (in shares) | 0 | 0 | 0 |
Intrinsic value of options exercised | $ 17.9 | $ 11.5 | $ 7.5 |
Intrinsic value of options outstanding | 196.6 |  |  |
Excess tax benefit | 30.1 | 20.5 | 7.7 |
Employee stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense |  |  | $ 1.6 |
Employee stock options and performance stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation expense | $ 0.0 | $ 0.6 |  |
2015 Stock incentive plan | Employee stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum term of stock options granted | 10 years |  |  |
2017 Performance metric, targeted free cash flow performance metric | PSOs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
PSOs vested (in shares) | 77,000 | 40,000 |  |
Percent of achievement of award target performance metric | 95.00% | 115.00% |  |
Class A common stock | 2015 Stock incentive plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Aggregate number of shares reserved for stock incentive plan | 4,026,493 |  |  | 2,000,000

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