Condensed Consolidated Statements of Equity (Unaudited) - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Income (Loss)
Beginning Balance (in shares) at Dec. 31, 2018		108.3
Beginning Balance at Dec. 31, 2018	$ 2,226.0	$ 1.1	$ 2,837.4	$ (600.2)	$ (12.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 89.4			89.4
Issuance of common stock, net (in shares)	2.0	2.0
Issuance of common stock, net	$ 105.0		105.0
Stock-based compensation expense	4.5		4.5
Tax payment upon exercise of equity awards	(8.7)		(8.7)
Foreign currency translation adjustment	0.6				0.6
Net gain (loss) on cash flow hedging instruments	2.7				2.7
Dividends declared	(50.9)			(50.9)
Ending Balance (in shares) at Mar. 31, 2019		110.3
Ending Balance at Mar. 31, 2019	2,378.1	$ 1.1	2,938.2	(552.2)	(9.0)
Beginning Balance (in shares) at Dec. 31, 2019		114.8
Beginning Balance at Dec. 31, 2019	2,434.6	$ 1.1	3,202.0	(767.3)	(1.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	14.7			14.7
Issuance of common stock, net (in shares)		0.2
Issuance of common stock, net	0.6	$ 0.1	0.5
Stock-based compensation expense (in shares)		0.0
Stock-based compensation expense	3.7		3.7
Tax payment upon exercise of equity awards (in shares)		0.0
Tax payment upon exercise of equity awards	(6.3)		(6.3)
Foreign currency translation adjustment	(24.0)				(24.0)
Net gain (loss) on cash flow hedging instruments	(1.1)				(1.1)
Dividends declared	(58.4)			(58.4)
Ending Balance (in shares) at Mar. 31, 2020		115.0
Ending Balance at Mar. 31, 2020	$ 2,363.8	$ 1.2	$ 3,199.9	$ (811.0)	$ (26.3)