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Net (Loss) Income Per Share - Schedule of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Subsidiary, Sale of Stock [Line Items]
Net (loss) income - basic and diluted	$ (57.6)	$ 53.8	$ 59.4	$ 3.0
Weighted-average common shares outstanding:
Basic (in shares)	93.3	91.9	93.0	91.4
Effect of dilutive securities:
Diluted (in shares)	93.3	96.1	98.0	95.2
Net (loss) income per share:
Basic (in USD per share)	$ (0.62)	$ 0.59	$ 0.64	$ 0.03
Diluted (in USD per share)	$ (0.62)	$ 0.56	$ 0.61	$ 0.03
2024 Notes
Effect of dilutive securities:
2024 Notes (in shares)	0.0	1.3	2.0	0.8
Stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.0	2.5	2.5	2.6
Restricted stock
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.0	0.5	0.5	0.4

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