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Stock-Based Compensation - Effect of Recording Stock-Based Compensation (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 36.7	$ 29.5	$ 49.2
Windfall tax effect on stock-based compensation	(4.6)	(2.4)	(2.2)
Net effect on net income	$ 32.1	$ 27.1	$ 47.0
Basic	$ 0.58	$ 0.49	$ 0.86
Diluted	$ 0.58	$ 0.49	$ 0.85
Restricted Stock Units (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 33.8	$ 27.0	$ 47.1
Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense	$ 2.9	$ 2.5	$ 2.1

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