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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. 24, 2019
May 26, 2019
Derivatives, Fair Value [Line Items]    
Derivative contracts, derivative assets, fair value $ 1.8 $ 0.1
Derivative contracts, derivative liabilities, fair value 0.4 0.9
Equity forwards    
Derivatives, Fair Value [Line Items]    
Derivative contracts, derivative assets, fair value 1.8 0.0
Derivative contracts, derivative liabilities, fair value $ 0.0 0.8
Equity forwards | Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative contracts, number of shares outstanding (in shares) 0.3  
Derivative contracts, weighted-average forward rates (in dollars per share) $ 101.59  
Derivative contracts, notional $ 34.2  
Derivative contracts, derivative assets, fair value 0.7 0.0
Derivative contracts, derivative liabilities, fair value $ 0.0 0.3
Equity forwards | Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative contracts, number of shares outstanding (in shares) 0.5  
Derivative contracts, weighted-average forward rates (in dollars per share) $ 82.77  
Derivative contracts, notional $ 43.0  
Derivative contracts, derivative assets, fair value 1.1 0.0
Derivative contracts, derivative liabilities, fair value 0.0 0.5
Commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative contracts, notional 5.7  
Derivative contracts, derivative assets, fair value 0.0 0.1
Derivative contracts, derivative liabilities, fair value $ 0.4 $ 0.1