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Income Taxes, Income Tax Expense and Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Tax Expense Adjustments for Income Tax Provision Transition Tax $ (4.3)    
Increase (reduction) in income taxes from:      
Computed expected tax expense 146.5 $ 148.3 $ 187.5
State and local income taxes, net of federal income tax benefit 8.9 2.8 (0.1)
Amortization of goodwill and other intangibles (3.7) (3.4) (6.7)
Nondeductible expenses 18.9 14.6 7.0
International earnings taxed at various rates (8.7) (21.1) (69.0)
Valuation allowances 7.2 12.4 5.8
Other, net (5.1) 13.7 5.9
Total provision for income taxes $ 159.7 $ 214.3 $ 256.3
Increase (reduction) in income taxes from:      
U.S. federal income tax rate 21.00% 21.00% 35.00%
State and local income taxes, net of federal income tax benefit 1.30% 0.40% 0.00%
Amortization of goodwill and other intangibles (0.50%) (0.50%) (1.30%)
Nondeductible expenses 2.70% 2.10% 1.30%
International earnings taxed at various rates (1.30%) (3.00%) (12.90%)
Valuation allowances 1.00% 1.80% 1.10%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent (0.60%) (6.70%) (23.50%)
Tax Expense for Income Tax Provision Transition Tax   $ 47.0 $ 125.9
Other, net (0.70%) 1.90% 1.10%
Total 22.90% 30.40% 47.80%