Stockholders' Deficit - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Jun. 19, 2017	Jan. 01, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Employee Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for awards under incentive compensation plan (in shares)		2,000,000.0
Maximum employee subscription rate		15.00%
Discount from market price		15.00%
Shares issued			83,000	54,000
Average price of shares issues (in usd per share)			$ 22.79	$ 30.63
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			$ 12.2	$ 3.7	$ 6.4
Stock options granted (in shares)			400,000.0
Grants, weighted average grant date fair value (in usd per share)			$ 42.74
Fair value of options granted			$ 9.1
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized			$ 6.7
Unvested stock options (in shares)			2,100,000
Weighted-average period of amortization			2 years
Average remaining contract term			5 years 9 months
Options exercisable at end of period (in usd per share)			$ 18.23
Cash received from exercise of stock options			$ 7.9
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			31.5	$ 23.0	$ 28.8
Unrecognized stock-based compensation expense relating to unvested awards that will be amortized			$ 47.8
Weighted-average period of amortization			2 years
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)			19,400,000
Shares available for grant (in shares)			3,100,000
Preexisting Incentive Compensation Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for issuance (less than)			100,000.0
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
Shares holders are entitled to (in shares)	0.0001
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