Share-Based Compensation - Compensation Expense for Share-Based Awards (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 10.4	$ 7.7	$ 39.6	$ 32.5
Income tax benefit	(2.6)	(1.9)	(9.9)	(8.1)
Share-based compensation expense, net of tax benefit	7.8	5.8	29.7	24.4
Restricted Stock
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	5.7	4.1	25.7	21.5
Performance Units
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total share-based compensation expense	$ 4.7	$ 3.6	$ 13.9	$ 11.0