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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Loss Carryforwards [Line Items]      
Provisional one-time net benefit from changes in U.S. tax laws $ 194.1    
Net income tax benefit resulting from re-measurement of Company's deferred tax assets and liabilities 216.9    
Provisional amount for repatriation tax liability $ 22.8    
State net operating loss carryforwards, expiration period 19 years    
Foreign operating loss carryforwards, expiration period 20 years    
Operating loss carryforwards, valuation allowance $ 24.1 $ 22.1  
Amount of temporary difference due to repatriation of earnings from sale or liquidation of subsidiary 270.9    
Unrecognized tax benefits that, if recognized, would affect effective tax rate 32.4 26.0 $ 25.3
Accrued income tax interest and related charges 1.7 1.4 $ 1.8
State and Local Jurisdiction      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 432.6    
Foreign Tax Authority      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards 61.5    
Foreign Tax Authority | Valuation Allowance, Operating Loss Carryforwards      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards, valuation allowance 24.1    
Increase in valuation allowance, state net operating loss carryforward and realized deferred tax benefit 2.0 $ 1.6  
Foreign Tax Authority | Expire over a 20-year period      
Operating Loss Carryforwards [Line Items]      
Operating loss carryforwards $ 51.8