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Income Taxes, Income Tax Expense and Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Tax Expense Adjustments for Income Tax Provision Transition Tax	$ 0.0	$ (4.3)	$ 47.0
Increase (reduction) in income taxes from:
Computed expected tax expense	111.2	146.5	148.3
State and local income taxes, net of federal income tax benefit	9.4	8.9	2.8
Amortization of goodwill and other intangibles	(3.3)	(3.7)	(3.4)
Nondeductible expenses	11.2	18.9	14.6
International earnings taxed at various rates	(20.5)	(8.7)	(21.1)
Valuation allowances	4.3	7.2	12.4
Tax Expense Adjustments for Income Tax Provision Transition Tax	0.0	(4.3)	47.0
Other, net	(5.4)	(5.1)	13.7
Total provision for income taxes	$ 106.9	$ 159.7	$ 214.3
Increase (reduction) in income taxes from:
U.S. federal income tax rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal income tax benefit	1.80%	1.30%	0.40%
Amortization of goodwill and other intangibles	(0.60%)	(0.50%)	(0.50%)
Nondeductible expenses	2.10%	2.70%	2.10%
International earnings taxed at various rates	(3.90%)	(1.30%)	(3.00%)
Valuation allowances	0.80%	1.00%	1.80%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	(0.60%)	6.70%
Other, net	(1.00%)	(0.70%)	1.90%
Total	20.20%	22.90%	30.40%

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