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Leases - Components of Lease Expense (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Lessee, Lease, Description [Line Items]    
Amortization of right-of-use assets $ 0.6 $ 1.2
Interest on lease liabilities 0.2 0.5
Total lease cost 28.8 86.6
Cost of sales    
Lessee, Lease, Description [Line Items]    
Operating leases 22.4 67.9
Selling, General and Administrative Expenses [Member]    
Lessee, Lease, Description [Line Items]    
Operating leases $ 5.6 $ 17.0