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Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Numerator:
Net income	$ 122.3	$ 69.1
Denominator:
Shares used in net income per common share – basic	55,275,000	54,918,000
Effect of dilutive securities	362,000	318,000
Shares used in net income per common share – diluted	55,637,000	55,236,000
Net income per common share:
Basic	$ 2.21	$ 1.26
Diluted	$ 2.20	$ 1.25

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