Income Taxes (Reconciliation of Income Tax Rate) (Details) - USD ($) $ in Millions	3 Months Ended				12 Months Ended
	Dec. 31, 2025	Sep. 30, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Income Tax Expense (Benefit), Effective Income Tax Rate Reconciliation, Amount [Abstract]
Provision at the U.S. statutory rate of 21%					$ 209.3	$ 209.9	$ 155.2
Increase (reduction) in tax expense resulting from:
State income tax, net of federal income tax benefit					24.8	23.2	16.4
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount					(0.5)
Effective Income Tax Rate Reconciliation, Tax Contingency, Amount					0.4
Tax credits, net of unrecognized tax benefits					(3.0)	(5.3)	(3.4)
Change in unrecognized tax benefits						0.5	0.4
Change in valuation allowance					(0.6)	0.0	0.1
Foreign taxes at rates other than U.S. statutory rate						(61.1)	(40.3)
Deemed inclusions						7.6	6.1
global intangible low taxed income					14.0	20.8	17.5
Effective Income Tax Rate Reconciliation, Cross-Border, Other, Amount					4.3
Change in rates from the Tax Act & other law changes					0.0	0.0	0.2
Excess tax benefits from stock-based compensation						(8.0)	(5.2)
Miscellaneous other						0.7	0.7
Total provision for income taxes	$ 36.2	$ 57.5	$ 66.1	$ 31.2	$ 191.0	$ 188.3	$ 147.7
Effective Income Tax Rate Reconciliation, Percent [Abstract]
US federal statutory tax rate					21.00%
State and local income taxes, net of federal income tax effect					2.50%
Effects of changes in tax laws or rates enacted in the current period					0.00%
Global intangible low-taxed income					1.40%
Other					0.50%
Tax credits					(0.30%)
Changes in valuation allowances					(0.10%)
Nontaxable income					(0.10%)
Changes in unrecognized tax benefits					0.00%
Effective tax rate					19.20%
UNITED STATES
Increase (reduction) in tax expense resulting from:
Nontaxable income					$ (41.1)
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Nontaxable income					(4.10%)
Mexico [Member]
Increase (reduction) in tax expense resulting from:
Nontaxable income					$ (42.3)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount					3.1
Foreign taxes at rates other than U.S. statutory rate					$ 15.2
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Nontaxable income					(4.10%)
Other					0.30%
Foreign tax effects					1.50%
Foreign Tax Jurisdiction, Other
Increase (reduction) in tax expense resulting from:
Foreign taxes at rates other than U.S. statutory rate					$ 7.4
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Foreign tax effects					0.70%