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Income Taxes, Income Tax Expense and Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Increase (reduction) in income taxes from:        
Computed expected tax expense   $ 183.8 $ 154.8 $ 202.7
State and local income taxes, net of federal income tax benefit   (0.4) 2.8 5.9
Amortization of goodwill and other intangibles   (6.7) (5.7) (5.1)
Nondeductible expenses   7.0 6.7 5.4
International earnings taxed at various rates   (68.7) (59.1) (57.0)
Valuation allowances   5.8 8.3 (4.7)
Recognition of tax benefit, net of nondeductible indemnification asset write-off   0.0 0.0 (8.3)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Amount   141.3 0.0 0.0
Other, net   5.7 0.2 (6.1)
Total provision for income taxes   $ 267.8 $ 108.0 $ 132.8
Increase (reduction) in income taxes from:        
U.S. federal income tax rate 21.00% 35.00% 35.00% 35.00%
State and local income taxes, net of federal income tax benefit   (0.10%) 0.60% 1.00%
Amortization of goodwill and other intangibles   (1.30%) (1.30%) (0.90%)
Nondeductible expenses   1.30% 1.50% 0.90%
International earnings taxed at various rates   (13.10%) (13.40%) (9.80%)
Valuation allowances   1.10% 1.90% (0.80%)
Effective Income Tax Rate Reconciliation, Tax Contingency, Other, Percent   0.00% 0.00% (1.40%)
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent   26.90% 0.00% 0.00%
Other, net   1.20% 0.10% (1.10%)
Total   51.00% 24.40% 22.90%