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Commitments and Contingencies - Future Minimum Lease Payments (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]      
Lease Expense Under Rental $ 26.6 $ 26.3 $ 28.6
Future Minimum Operating Lease Payment For Year 2019 17.6    
Future Minimum Operating Lease Payment For Year 2020 13.7    
Future Minimum Operating Lease Payment For Year 2021 9.3    
Future Minimum Operating Lease Payment For Year 2022 5.4    
Future Minimum Operating Lease Payment For Year 2023 4.1    
Future Minimum Operating Lease Payment Due Thereafter $ 15.2