Stockholders' Deficit - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions				12 Months Ended
	Jul. 31, 2020	Jun. 19, 2017	Jan. 01, 2017	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense recognized				$ 61.0	$ 37.0	$ 44.0
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for awards under incentive compensation plan (in shares)			2,000,000
Maximum employee subscription rate							15.00%
Discount from market price	15.00%
Shares issued				80,000	100,000	83,000
Average price of shares issues (in usd per share)				$ 19.55	$ 19.32	$ 22.79
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period from first anniversary of grant			4 years
Award expiration period			10 years
Stock-based compensation expense recognized				$ 9.0	$ 5.0	$ 12.0
Grants, weighted average grant date fair value (in usd per share)				$ 35.41
Fair value of options granted				$ 54.0
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized				$ 33.0
Unvested stock options (in shares)				2,000,000
Weighted-average period of amortization				2 years
Average remaining contract term				6 years 3 months 18 days
Options exercisable at end of period (in usd per share)				$ 33.60
Cash received from exercise of stock options				$ 4.0
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period from first anniversary of grant			4 years
Stock-based compensation expense recognized				30.0	$ 23.0	$ 32.0
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized				$ 40.0
Weighted-average period of amortization				2 years
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized				$ 8.0
Weighted-average period of amortization				7 months 6 days
Rights Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (in shares)		20,000
2003 Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for awards under incentive compensation plan (in shares)				23,000,000
Shares available for grant (in shares)				3,000,000
Preexisting Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (less than)				100,000
Series A Junior Participating Preferred Stock | Amended and Restated Rights Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred par value (in usd per share)		$ 0.001
Exercise price of rights (in usd per share)		$ 109.00
Preferred shares outstanding (in shares)				0
Preferred Share Purchase Right | Series A Junior Participating Preferred Stock | Amended and Restated Rights Agreement
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred dividend (in shares)		1
Preferred shares issued on exercise (in shares)				0