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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
3 Months Ended
Aug. 30, 2020
May 31, 2020
Derivatives, Fair Value [Line Items]    
Derivative assets $ 5.1 $ 6.5
Derivative liabilities 1.2 2.1
Equity forwards:    
Derivatives, Fair Value [Line Items]    
Derivative assets 3.9 6.2
Derivative liabilities $ 0.0 0.0
Equity forwards: | Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Number of shares outstanding (in shares) 0.2  
Weighted-average forward rates (in dollars per share) $ 107.34  
Notional values $ 21.3  
Derivative assets 1.2 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) $ 123.42  
Notional values $ 56.0  
Derivative assets 2.7 4.4
Derivative liabilities 0.0 0.0
Commodity contracts:    
Derivatives, Fair Value [Line Items]    
Derivative assets 1.2 0.3
Derivative liabilities 1.2 2.1
Commodity contracts: | Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional values 12.8  
Derivative assets 1.1 0.3
Derivative liabilities 1.1 1.8
Commodity contracts: | Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Notional values 1.2  
Derivative assets 0.1 0.0
Derivative liabilities $ 0.1 $ 0.3