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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]              
Effective tax rate       22.70% 37.40% 23.60% 37.70%
Cash paid for income taxes           $ 43.5 $ 270.5
Federal corporate tax rate 21.00% 35.00%          
Tax Cuts and Jobs Act of 2017, provisional income tax expense       $ 0.3      
Accrued liability for penalties       0.5   0.5  
Accrued liability for interest related to uncertain tax positions and penalties       11.7   11.7  
Income Tax Contingency [Line Items]              
Unrecognized tax benefits, increase resulting from prior period tax positions       30.5      
Valuation allowance, state loss carryforwards       $ 78.0   $ 78.0  
Scenario, Forecast | Minimum              
Income Tax Contingency [Line Items]              
Unrecognized tax benefits, increase resulting from prior period tax positions     $ 20.0        
Scenario, Forecast | Maximum              
Income Tax Contingency [Line Items]              
Unrecognized tax benefits, increase resulting from prior period tax positions     $ 40.0