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Income Taxes (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Effective tax rate            
Effective income tax rate (as a percent)   20.07% (2507.15%) 22.79% (1232.94%)  
Effect of Tax Cuts and Jobs Act of 2017            
Federal statutory tax rate       21.00%   35.00%
Provisional increase to deferred tax expense $ 261.3     $ 3.5 $ 2.6  
Additional tax expense   $ 0.9        
Benefited from the deferred tax valuation allowance reversal     $ 766.2   $ 766.2