Income Taxes - Valuation Allowance for Deferred Tax Assets (Details) - Valuation allowance for deferred tax assets - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 115.7	$ 107.3	$ 106.4
Revaluation or additions due to acquisitions or mergers	22.9	0.0	0.0
Charged to tax expense	(10.8)	6.4	3.1
Charged to other accounts	(2.2)	2.0	(2.2)
Ending balance	$ 125.6	$ 115.7	$ 107.3