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Leases - Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Leases [Abstract]      
Operating cash flows from operating leases $ 107.9    
Operating cash flows from finance leases 0.7    
Financing cash flows from finance leases 1.6 $ 1.9 $ 3.5
Operating lease assets obtained in exchange for new lease obligations 63.2    
Finance lease assets obtained in exchange for new lease obligations $ 31.3