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Fair Value Measurements - Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Millions
Dec. 01, 2018
Jun. 02, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investment Owned, at Cost $ 8.2 $ 8.5
Unrealized Gain/(loss) 0.0 0.1
Investment Owned, at Fair Value 8.2 8.6
Fixed Income Securities    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cost 7.5 7.8
Unrealized Gain/(loss) (0.1) (0.1)
Market Value 7.4 7.7
Mutual funds    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Equity Securities, FV-NI, Cost 0.7 0.7
Available-for-sale Equity Securities, Gross Unrealized Gain 0.1 0.2
Mutual funds - equity $ 0.8 $ 0.9