Share-Based Compensation - Allocation of Compensation Expense (Benefit) by Plan (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Share-Based Compensation
Total share-based compensation expense before tax	$ 43.4	$ 37.8	$ 77.3	$ 69.6
Stock options
Share-Based Compensation
Total share-based compensation expense before tax	12.8	11.1	24.3	19.6
RSUs
Share-Based Compensation
Total share-based compensation expense before tax	29.7	26.0	51.2	49.4
STAP awards
Share-Based Compensation
Total share-based compensation expense before tax	0.0	0.0	0.0	(0.8)
ESPP
Share-Based Compensation
Total share-based compensation expense before tax	$ 0.9	$ 0.7	$ 1.8	$ 1.4

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