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Income Taxes, Income Tax Expense and Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Computed expected tax expense $ 154.8 $ 202.7 $ 170.0
Increase (reduction) in income taxes from:      
State and local income taxes, net of federal income tax benefit 2.8 5.9 5.1
Amortization of goodwill and other intangibles (5.7) (5.1) (5.2)
Nondeductible expenses 6.7 5.4 5.1
International earnings taxed at various rates (59.1) (57.0) (59.1)
Valuation allowances 8.3 (4.7) 7.4
Recognition of tax benefit, net of nondeductible indemnification asset write-off 0.0 (8.3) (22.4)
Other, net 0.2 (6.1) (3.3)
Total provision for income taxes $ 108.0 $ 132.8 $ 97.6
Increase (reduction) in income taxes from:      
U.S. federal income tax rate 35.00% 35.00% 35.00%
State and local income taxes, net of federal income tax benefit 0.60% 1.00% 1.00%
Amortization of goodwill and other intangibles (1.30%) (0.90%) (1.10%)
Nondeductible expenses 1.50% 0.90% 1.00%
International earnings taxed at various rates (13.40%) (9.80%) (12.20%)
Valuation allowances 1.90% (0.80%) 1.50%
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent 0.00% (1.40%) (4.60%)
Other, net 0.10% (1.10%) (0.50%)
Total 24.40% 22.90% 20.10%