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Leases (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2019
Jun. 01, 2019
Leases [Abstract]    
Total lease costs $ 15.5  
Operating lease costs 12.7  
Short-term lease costs 0.6  
Variable lease costs 2.2  
Supply Arrangement Variable Lease Costs 21.9  
2020 36.0  
2021 44.8  
2022 42.0  
2023 38.0  
2024 32.3  
Thereafter 100.9  
Total lease payments 294.0  
Less interest 31.3  
Present value of lease liabilities 262.7  
Leases Not yet Commenced Future Payments 26.6  
Lease liabilities, noncurrent $ 200.2 $ 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  
Weighted Average Discount Rate, Percent 3.10%  
Cash paid for amounts included in the measurement of lease liabilities $ 12.5  
Right-of-use assets obtained in exchange for operating lease liabilities $ 4.6