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Derivative Instruments and Hedging Activities (Notional and Fair Values of Derivative Contracts Designated and Not Designated as Hedging Instruments) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
6 Months Ended
Nov. 29, 2020
May 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative assets $ 0.5 $ 6.5
Derivative liabilities 0.8 2.1
Equity forwards:    
Derivatives, Fair Value [Line Items]    
Derivative assets 0.0 6.2
Derivative liabilities $ 0.1 0.0
Equity forwards: | Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Number of shares outstanding (in shares) 0.3  
Weighted-average forward rates (in dollars per share) $ 104.56  
Notional values $ 31.2  
Derivative assets 0.0 1.8
Derivative liabilities $ 0.0 0.0
Equity forwards: | Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Number of shares outstanding (in shares) 0.5  
Weighted-average forward rates (in dollars per share) $ 103.26  
Notional values $ 52.9  
Derivative assets 0.0 4.4
Derivative liabilities 0.1 0.0
Commodity contracts:    
Derivatives, Fair Value [Line Items]    
Derivative assets 0.5 0.3
Derivative liabilities 0.7 2.1
Commodity contracts: | Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional values 9.3  
Derivative assets 0.5 0.3
Derivative liabilities 0.6 1.8
Commodity contracts: | Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional values 0.5  
Derivative assets 0.0 0.0
Derivative liabilities $ 0.1 $ 0.3