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Income Taxes - Narratives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Deferred tax asset $ 101.0 $ 81.4  
Deferred tax liability 32.3 222.2  
Deferred tax asset on net operating losses 104.1 92.7  
Valuation allowance, net operating losses 68.4    
Pretax income of non-United States operations 514.9 482.2 $ 511.2
Unremitted earnings of non-United States subsidiaries that are considered to be permanently invested 264.3    
Unremitted earnings of non-United States subsidiaries that may be remitted 1,746.3    
Deferred tax liability, undistributed foreign earnings 5.5 164.8  
Interest and penalties related to unrecognized tax benefits $ 0.2 $ 0.3 $ 12.1