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Share-Based Compensation (Costs Associated with Share-Based Compensation Plans) (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 9.4	$ 9.0	$ 32.8	$ 32.0
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	6.9	6.8	25.8	25.8
PRSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	1.1	0.7	3.5	2.5
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 1.4	$ 1.5	$ 3.5	$ 3.7

X

- Definition

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

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