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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Sep. 30, 2018
Mar. 31, 2018
Business Acquisition [Line Items]              
Effective tax rate, percent       30.30% 45.30%    
Corporate tax rate 21.00% 35.00%   24.50%      
Tax expense     $ 0.6 $ 36.7   $ 3.0  
Transition tax             $ 30.0
State and Local Jurisdiction              
Business Acquisition [Line Items]              
Tax expense       $ 0.7