EARNINGS (LOSS) PER SHARE - Computations of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Earnings Per Share Disclosure [Line Items]
Net Income (Loss)		$ 188.2	$ (271.2)	$ (422.8)
Income (loss) allocated to participating share-based awards	[1]	(3.3)	3.8	6.1
Basic net (loss) income attributable to common stockholders		184.9	(267.4)	(416.7)
Interest expense on convertible notes, net of tax	[2]	18.2	0.0	0.0
Diluted net (loss) income attributable to common stockholders		$ 203.1	$ (267.4)	$ (416.7)
Basic weighted average shares outstanding		119.1	118.2	117.3
Common equivalent shares for restricted stock units	[3]	0.9	0.0	0.0
Common equivalent shares for convertible notes	[2]	32.0	0.0	0.0
Common equivalent shares for warrants	[4]	0.0	0.0	0.0
Diluted weighted average shares outstanding		152.0	118.2	117.3
Basic (loss) earnings per share attributable to common stockholders		$ 1.55	$ (2.26)	$ (3.55)
Diluted (loss) earnings per share attributable to common stockholders		$ 1.34	$ (2.26)	$ (3.55)
Restricted Stock Units (RSUs)
Earnings Per Share Disclosure [Line Items]
Common equivalent shares for restricted stock units			0.4	0.0

[1] For the years ended December 31, 2021, 2022 and 2023, a weighted average of approximately 1.7 shares, 1.7 shares and 2.1 shares of unvested restricted stock, respectively, are considered participating securities.

[2] For the years ended December 31, 2021 and 2022, diluted loss per share excludes the assumed conversion of the 4.50% Convertible Senior Notes into 32.0 shares of common stock, as they would have been anti-dilutive. See further discussion below.

[3] For the years ended December 31, 2021 and 2022, approximately 0.0 and 0.4 common equivalent shares for performance stock units were excluded because they were anti-dilutive.

[4] For all periods presented, diluted earnings (loss) per share excludes the warrants, as they would be anti-dilutive.