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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. 25, 2018
May 27, 2018
Derivatives, Fair Value [Line Items]    
Derivative contracts, derivative assets, fair value $ 1.2 $ 1.1
Derivative contracts, derivative liabilities, fair value 0.7 0.0
Equity forwards    
Derivatives, Fair Value [Line Items]    
Derivative contracts, derivative assets, fair value 0.0 0.6
Derivative contracts, derivative liabilities, fair value $ 0.2 0.0
Equity forwards | Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative contracts, number of shares outstanding 0.5  
Derivative contracts, weighted-average forward rates (in dollars per share) $ 88.78  
Derivative contracts, notional $ 38.6  
Derivative contracts, derivative assets, fair value 0.0 0.2
Derivative contracts, derivative liabilities, fair value $ 0.1 0.0
Equity forwards | Not Designated as Hedging Instruments    
Derivatives, Fair Value [Line Items]    
Derivative contracts, number of shares outstanding 0.5  
Derivative contracts, weighted-average forward rates (in dollars per share) $ 75.07  
Derivative contracts, notional $ 39.0  
Derivative contracts, derivative assets, fair value 0.0 0.4
Derivative contracts, derivative liabilities, fair value 0.1 0.0
Commodity contracts    
Derivatives, Fair Value [Line Items]    
Derivative contracts, notional 10.0  
Derivative contracts, derivative assets, fair value 1.2 0.5
Derivative contracts, derivative liabilities, fair value $ 0.5 $ 0.0