Income Taxes, Income Tax Reconciliation and Allocation of Income Tax Provision (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Provision	$ 54.0	$ 196.3	$ 172.3
Effective Income Tax Rate Reconciliation, Intercompany sale of intellectual property rights, Amount	0.0	53.1	0.0
Effective Income Tax Rate Reconciliation, Nondeductible loss on intercompany sale, Amount	0.0	6.9	0.0
Effective Income Tax Rate Reconciliation, FDII, Amount	(8.7)	(16.6)	(18.4)
Deferred Tax Reassessment	7.3	2.5	6.4
Effective Income Tax Rate Reconciliation, Tax Reserve Reassessment	(3.4)	0.8	(0.1)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Amount	6.8	0.0	0.0
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Tax Provision at 35 Percent	42.7	132.1	179.3
State and Local Income Taxes, Net of Federal Income Tax Effect	4.2	13.3	19.5
Deferred Tax Asset Valuation Allowance	5.0	17.8	(10.4)
Change in Estimates Related to Prior Years and Prior Years Amended Tax Return Filings	3.4	1.8	(1.3)
Federal and State Tax Credits	(10.2)	(15.2)	(16.6)
Taxes Related to Foreign Income, Net of Credits	2.6	(4.5)	12.1
Deferred Tax Reassessment	7.3	2.5	6.4
Other	4.3	4.3	1.8
Income Tax Provision	$ 54.0	$ 196.3	$ 172.3
Effective Tax Rate	26.60%	31.20%	20.20%
Income Tax Expense (Benefit), Intraperiod Tax Allocation [Abstract]
Continuing Operations	$ 54.0	$ 196.3	$ 172.3
Deferred Tax Liabilities, Undistributed Foreign Earnings	$ 0.0	$ 0.0