Fair Value Measurements (Fair Values of Financial Instruments Measured at Fair Value on Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Nov. 25, 2018	May 27, 2018
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	$ 0.5	$ 1.1
Commodities futures, swaps & options
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.7	0.5
Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(0.2)	0.6
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) | Commodities futures, swaps & options
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	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	0.5	1.1
Significant other observable inputs (Level 2) | Commodities futures, swaps & options
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.7	0.5
Significant other observable inputs (Level 2) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(0.2)	0.6
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) | Commodities futures, swaps & options
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	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