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Employee Benefit Plans - Stock Incentive Plans Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 17, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Mar. 01, 2019 | Dec. 01, 2017
Time Based Vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Time-vesting awards, portion to be vested per year |  | 25.00% |  |  |  |
Vesting period |  | 4 years |  |  |  |
2017 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares granted in period under equity incentive plan | 189,499 |  |  |  |  |
Shares cancelled under equity incentive plan |  | 575,506 |  |  |  |
Shares withheld for payment of taxes |  | 215,900 |  |  |  |
2019 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 1 year |  |  |  |
2019 Equity Incentive Plan | Class A common stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant |  | 10,501,907 |  |  | 9,900,000 |
RSUs | Performance Based Vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period |  | 3 years |  |  |  |
RSUs | Time Based Vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant |  | 1,150,761 | 1,493,788 | 1,332,085 |  |
Percentage of target restricted stock unit |  | 33.30% |  |  |  |
RSUs | Total Shareholder Return |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of target restricted stock unit |  | 33.30% |  |  |  |
Measurement period |  | 6 years |  |  |  |
Number of trading days required for purposes of measuring shareholder return based on average closing price of common stock immediately preceding grant date |  | 60 days |  |  |  |
RSUs | Earnings Per Share Performance |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Percentage of target restricted stock unit |  | 33.30% |  |  |  |
Measurement period |  | 6 years |  |  |  |
RSUs | Maximum | Performance Based Vesting |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant |  | 910,346 | 888,726 | 1,014,269 |  |
RSUs | 2012 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant |  | 310,023 |  |  |  |
RSUs | 2017 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares reserved for future issuance |  | 4,677,453 |  |  |  |
RSUs | 2017 Equity Incentive Plan | Time Based Vesting | Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant |  | 55,973 |  |  |  | 939,605,000
RSUs | 2017 Equity Incentive Plan | Maximum | Performance Based Vesting | Employees |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant |  | 195,907 |  |  |  | 3,288,618,000
Stock Options | 2019 Equity Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Shares available for future grant |  | 6,265,195 |  |  |  |
Non-Vested Stock Awards |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Compensation expense related to non-vested awards |  | $ 60.4 | $ 127.7 | $ 128.2 |  |
Unrecognized estimated compensation cost |  | $ 121.1 |  |  |  |
Weighted average period of recognition |  | 2 years 7 months 6 days |  |  |  |

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