Share-Based Compensation - Allocation of Compensation Expense (Benefit) by Plan (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Share-Based Compensation
Total share-based compensation expense before tax	$ 49.7	$ 13.8	$ 75.3	$ 1.4
Stock options
Share-Based Compensation
Total share-based compensation expense before tax	8.1	1.6	13.8	6.5
RSUs
Share-Based Compensation
Total share-based compensation expense before tax	19.2	13.6	34.7	25.8
STAP awards
Share-Based Compensation
Total share-based compensation expense before tax	21.9	(1.9)	25.8	(31.9)
ESPP
Share-Based Compensation
Total share-based compensation expense before tax	$ 0.5	$ 0.5	$ 1.0	$ 1.0

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