Share-Based Compensation (Costs Associated with Share-Based Compensation Plans) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 13.3	$ 17.2	$ 40.4	$ 47.8
RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	10.6	13.8	33.3	39.2
PRSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	1.1	2.0	3.2	5.0
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 1.6	$ 1.4	$ 3.9	$ 3.6

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details