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Share-Based Compensation (Costs Associated with Share-Based Compensation Plans) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 49.1	$ 67.3	$ 53.6
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	38.4	57.9	47.7
PRSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	4.5	2.8	0.0
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 6.2	$ 6.6	$ 5.9

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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