Fair Value Measurements (Fair Values of Financial Instruments Measured at Fair Value on Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Feb. 23, 2020	May 26, 2019
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	$ (0.2)	$ (0.8)
Commodity contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(0.7)
Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.5	(0.8)
Quoted prices in active market for identical assets (liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	0.0	0.0
Quoted prices in active market for identical assets (liabilities) (Level 1) | Commodity contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0
Quoted prices in active market for identical assets (liabilities) (Level 1) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	0.0
Significant other observable inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	(0.2)	(0.8)
Significant other observable inputs (Level 2) | Commodity contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(0.7)
Significant other observable inputs (Level 2) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.5	(0.8)
Significant unobservable inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	0.0	0.0
Significant unobservable inputs (Level 3) | Commodity contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0
Significant unobservable inputs (Level 3) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	$ 0.0	$ 0.0