Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Examination [Line Items]
Income tax expense at U.S. federal rate	$ 99.5	$ 36.6	$ 26.7
Income tax expense at U.S. federal rate, percent	21.00%	21.00%	21.00%
State income taxes, net of federal income tax benefit	$ 18.4	$ 7.3	$ 6.4
State income taxes, net of federal income tax benefit, percent	3.90%	4.20%	5.00%
Stock-based compensation activity	$ (2.3)	$ 1.6	$ (1.5)
Stock-based compensation activity, percent	(0.50%)	0.90%	(1.20%)
Equity in net income (loss) of unconsolidated subsidiaries (including holding gains upon acquisition)	$ 3.4	$ 1.1	$ 1.0
Holding gain upon acquisition of additional ownership of equity method investments, percent	0.70%	0.60%	0.80%
Effective Income Tax Rate Reconciliation, Gain on Sale of Business, Percent	(2.00%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Gain on Sale of Business	$ (9.7)	$ 0.0	$ 0.0
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	0.00%	0.00%	1.40%
Effective Income Tax Rate Reconciliation, Other Reconciling Items, Amount	$ 0.0	$ 0.0	$ 1.8
Net change in valuation allowance related to non-U.S. deffered tax assets, primarily net operating losses	$ 0.5	$ (3.2)	$ 7.7
Net change in valuation allowance related to non-U.S. deffered tax assets, primarily net operating losses, percent	0.10%	(1.80%)	6.10%
Difference between U.S. federal statutory and foreign tax rates	$ 0.4	$ 1.7	$ (1.9)
Difference between U.S. federal statutory and foreign tax rates, percent	0.10%	1.00%	(1.50%)
Foreign tax provisions (GILTI, FDII, and BEAT)	$ (16.1)	$ (0.2)	$ (4.6)
Foreign tax provisions (GILTI, FDII, and BEAT), percent	(3.40%)	(0.10%)	(3.60%)
Change in deferred taxes with respect to unremitted foreign earnings, percent	1.40%	0.00%	0.00%
Income Tax Rate Reconciliation, Change in deferred taxes with respect to unremitted foreign earnings	$ 6.8	$ 0.0	$ 0.0
Change in unrecognized tax benefits	$ 2.9	$ (9.8)	$ 14.1
Changes in unrecognized tax benefits, percent	0.60%	(5.60%)	11.10%
Other tax credits	$ (5.9)	$ (4.1)	$ (3.8)
Other tax credits, percent	(1.20%)	(2.40%)	(3.00%)
Other - net	$ 6.1	$ 2.0	$ 10.6
Other - net, percent	1.20%	1.20%	8.40%
Income tax expense	$ 104.0	$ 33.0	$ 56.5
Income tax expense, percent	21.90%	19.00%	44.50%