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Net Income Per Share - Schedule of Net Income Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Subsidiary, Sale of Stock [Line Items]
Net income - basic and diluted	$ 32.1	$ 37.4
Weighted-average common shares outstanding:
Basic (in shares)	94.2	92.6
Effect of dilutive securities:
Diluted (in shares)	98.2	97.0
Net income per share:
Basic (in USD per share)	$ 0.34	$ 0.40
Diluted (in USD per share)	$ 0.33	$ 0.39
2024 Notes
Effect of dilutive securities:
2024 Notes (in shares)	1.4	1.5
Stock options
Effect of dilutive securities:
Effect of dilutive securities (in shares)	2.1	2.4
Restricted stock
Effect of dilutive securities:
Effect of dilutive securities (in shares)	0.5	0.5

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