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Stock-based Compensation - Narrative (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 24, 2020 shares | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2020 $ / shares shares | Dec. 31, 2020 USD ($) plan $ / shares shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($) | May 11, 2017 shares | Dec. 31, 2003 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of compensation plans | plan |  |  |  |  | 2 |  |  |  |
Stock split ratio | 4 |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  | $ 104.5 | $ 26.8 | $ 24.8 |  |
Stock options granted (in shares) | shares |  |  |  |  |  | 0 |  |  |
Total intrinsic value of options exercised | $ |  |  |  |  | $ 6.0 | $ 5.9 | 3.9 |  |
Performance-based Restricted Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  |  | 600,000 | 3,500,000 | 300,000 |  |  |
Granted (in dollars per share) | $ / shares |  |  |  | $ 21.39 | $ 21.39 | $ 21.35 |  |  |
Total stock-based compensation expense | $ |  |  |  |  | $ 77.4 | $ 1.4 | 2.5 |  |
Restricted Stock Units and Deferred Stock Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Granted (in shares) | shares |  |  |  |  | 800,000 | 2,700,000 |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  | $ 20.81 | $ 10.77 |  |  |
Total stock-based compensation expense | $ |  |  |  |  | $ 22.2 | $ 20.5 | 15.6 |  |
Aggregate intrinsic value of RSUs and DSUs vested during the period | $ |  |  |  |  | 33.0 |  |  |  |
Stock Option |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  |  |  |  | $ 4.9 | $ 4.9 | $ 6.7 |  |
Long Term Incentive Plan 2013 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum number of common stock shares to be issued (in shares) | shares |  |  |  |  |  |  |  | 34,800,000 |
Additional shares due to stock split (in shares) | shares | 26,100,000 |  |  |  |  |  |  |  |
Amended And Restated 2003 Equity Incentive Plan | Stock Option |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Maximum number of common stock shares to be issued (in shares) | shares |  |  |  |  |  |  |  |  | 46,000,000.0
Additional shares due to stock split (in shares) | shares | 34,500,000 |  |  |  |  |  |  |  |
Aspirational Plan 2019 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Total stock-based compensation expense | $ |  | $ 4.2 | $ 45.2 |  |  |  |  |  |
Aspirational Plan 2019 | Performance-based Restricted Stock Units | Tranche one |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Percentage of target shares forfeited |  |  |  |  | 50.00% |  |  |  |
Award vesting rights, percentage |  |  |  |  | 50.00% |  |  |  |

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