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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2019
Sep. 01, 2018
Jun. 01, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax $ (8.8) $ (0.5)  
Total investments, cost 8.7   $ 8.7
Total investments, unrealized gain/(loss) 0.3   0.1
Total investments, market value 9.0   8.8
Mutual funds - fixed income      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mutual funds - fixed income, cost 8.0   7.9
Mutual funds - fixed income, unrealized gain/(loss) 0.1   0.0
Mutual funds - fixed income, market value 8.1   7.9
Mutual funds - equity      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Mutual funds - equity, cost 0.7   0.8
Mutual funds - equity, unrealized gain/(loss) 0.2   0.1
Mutual funds - equity, market value $ 0.9   $ 0.9