Share-Based Compensation - Compensation Expense for Share-Based Awards (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 9.9	$ 9.5	$ 29.2	$ 24.8
Income tax benefit	(2.5)	(2.4)	(7.3)	(6.2)
Share-based compensation expense, net of tax benefit	7.4	7.1	21.9	18.6
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	6.0	5.6	19.9	17.5
Performance Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 3.9	$ 3.9	$ 9.3	$ 7.3