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Net Income (Loss) Per Share - Schedule of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Subsidiary, Sale of Stock [Line Items]
Net income (loss) - basic and diluted	$ 79.6	$ 51.3	$ 117.0	$ (50.8)
Weighted-average common shares outstanding:
Basic (in shares)	93.0	91.4	92.8	91.2
Effect of dilutive securities:
Diluted (in shares)	98.2	94.8	97.6	91.2
Net income per share:
Basic (in USD per share)	$ 0.86	$ 0.56	$ 1.26	$ (0.56)
Diluted (in USD per share)	$ 0.81	$ 0.54	$ 1.20	$ (0.56)
2024 Notes
Effect of dilutive securities:
2024 Notes (in shares)	2.1	0.5	1.8	0.0
Stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	2.6	2.6	2.5	0.0
Restricted stock
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.5	0.3	0.5	0.0

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