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Fair Value of Financial Assets - Schedule of Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Millions
Jun. 01, 2019
Jun. 02, 2018
Gain (Loss) on Investments    
Cost $ 8.7 $ 8.5
Unrealized Gain/(Loss) 0.1 0.1
Market Value 8.8 8.6
Mutual funds - fixed income    
Gain (Loss) on Investments    
Cost   7.8
Unrealized Gain/(Loss) 0.0 (0.1)
Market Value 7.9 7.7
Mutual funds - equity    
Gain (Loss) on Investments    
Cost 0.8 0.7
Unrealized Gain/(Loss) 0.1 0.2
Market Value $ 0.9 $ 0.9