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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Feb. 29, 2020
Feb. 29, 2020
Jun. 01, 2019
Leases [Abstract]      
Total lease costs $ 15.9 $ 46.9  
Operating lease costs 13.1 38.5  
Short-term lease costs 0.7 1.9  
Variable lease costs 2.1 6.5  
Supply Arrangement Variable Lease Costs 18.6 64.3  
2020 12.3 12.3  
2021 47.7 47.7  
2022 44.1 44.1  
2023 39.7 39.7  
2024 33.9 33.9  
Thereafter 102.0 102.0  
Total lease payments 279.7 279.7  
Less interest 28.1 28.1  
Present value of lease liabilities 251.6 251.6  
Leases Not yet Commenced Future Payments 29.0 29.0  
Lease liabilities, noncurrent $ 188.5 $ 188.5 $ 0.0
2020     51.7
2021     46.8
2022     42.9
2023     39.0
2024     33.5
Thereafter     101.9
Total     $ 315.8
Weighted Average Remaining Lease Term 7 years 7 years  
Weighted Average Discount Rate, Percent 3.10% 3.10%  
Cash paid for amounts included in the measurement of lease liabilities $ 12.5 $ 38.4  
Right-of-use assets obtained in exchange for operating lease liabilities $ 0.3 $ 9.1