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Share-Based Compensation (Costs Associated with Share-Based Compensation Plans) (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 8.9	$ 8.2	$ 40.9	$ 60.2
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	6.5	6.3	32.3	52.0
PRSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	1.0	0.2	3.5	2.7
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 1.4	$ 1.7	$ 5.1	$ 5.5

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- Definition

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

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