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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2017
Sep. 30, 2016
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Jun. 30, 2016
Income Tax Disclosure [Abstract]            
Possible decrease in tax expense in next 12 months $ 1.9     $ 1.9    
Taxes paid on cash distribution $ 19.6     19.6   $ 15.9
Income tax benefit from reorganization   $ 876.1   $ 876.1    
Effective income tax rate 37.90%   7.20% (496.30%) 9.40%  
Increase (decrease) in income tax expense $ 7.9     $ (836.0)    
Increase in income tax expense due to impact of foreign rates 20.0     56.0    
Increase in changes in unrecognized tax benefits     $ 1.6   $ 9.9  
Decrease in income tax expense of federal rate applied to pretax income 10.5     14.4    
Decrease in deferred tax assets valuation allowance, amount 1.5     4.2    
Decrease in amortization of deferred charges $ 0.5     $ 2.2