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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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