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Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Commitments and Contingencies Disclosure [Abstract]      
Lease Expense Under Rental $ 26.3 $ 28.6 $ 29.4
Future Minimum Operating Lease Payment For Year 2016 19.3    
Future Minimum Operating Lease Payment For Year 2017 14.6    
Future Minimum Operating Lease Payment For Year 2018 11.8    
Future Minimum Operating Lease Payment For Year 2019 8.5    
Future Minimum Operating Lease Payment For Year 2020 7.2    
Future Minimum Operating Lease Payment Due Thereafter $ 15.3