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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jun. 30, 2018
Income Tax Disclosure [Abstract]          
Possible decrease in tax expense in next 12 months $ 3.3   $ 3.3    
Taxes paid on cash distribution 16.6   16.6   $ 28.5
Reversal of U.S. undistributed earnings accrual $ 14.8   $ 14.8    
Effective income tax rate 25.80% 38.50% 31.90% 39.80%  
Decrease in income tax expense $ 16.9   $ 14.4    
Effect of U.S. tax reform   $ 15.3   $ 15.3  
Effect of U.S. tax reform, BEAT 10.2   11.7    
Income tax expense from reorganization $ 4.6   8.3    
TCJA tax expense, provisional         $ 19.0
Measurement period adjustment     0.9    
TCJA tax expense, after adjustments     $ 18.1