Income Taxes (Income Tax Reconciliation and Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Income before income taxes and equity in net income (loss) of unconsolidated entities	$ 123.1	$ 151.9	$ 348.1	$ 328.4
Equity in investments of unconsolidated entities	(0.1)	(2.6)	(3.9)	(5.3)
Total	123.0	149.3	344.2	323.1
Income tax expense	$ 31.4	$ 29.6	$ 85.1	$ 70.1
Effective income tax rate	25.50%	19.80%	24.70%
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued [Abstract]
Current liability	$ 0.1		$ 0.1		$ 0.1
Non-current liability	13.5		13.5		11.7
Total liability for unrecognized tax benefits	$ 13.6		$ 13.6		11.8
Concentration Risk [Line Items]
Effective Income Tax Rate Reconciliation, Increase (Decrease) From Prior Year, PercentTaxes	5.70%		3.00%
Unrecognized Tax Benefits	$ 12.5		$ 12.5		11.1
Total Liability For Unrecognized Tax Benefits	$ 13.6		13.6		11.8
Effective tax rate				21.7
Undistributed Earnings of Foreign Subsidiaries not Permanently Reinvested					$ 142.0
Foreign Earnings Repatriated			150.0
Foreign Earnings Repatriated (net of witholding taxes)			$ 141.4
Geographic Concentration Risk | Cash, Cash Equivalents and Investments | Total International
Concentration Risk [Line Items]
Percentage of cash, cash equivalents and investments held by operations outside of US			78.00%