Fair Value Measurements (Fair Values Of Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	Feb. 25, 2018	May 28, 2017
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	$ (2.1)	$ 3.7
Commodities futures, swaps & options
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.2
Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(2.3)	(0.4)
Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		1.1
U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		2.0
Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		1.0
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	2.0
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
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
Quoted prices in active market for identical assets (liabilities) (Level 1) | Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Quoted prices in active market for identical assets (liabilities) (Level 1) | U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		2.0
Quoted prices in active market for identical assets (liabilities) (Level 1) | Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Significant other observable inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	(2.1)	1.7
Significant other observable inputs (Level 2) | Commodities futures, swaps & options
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.2
Significant other observable inputs (Level 2) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(2.3)	(0.4)
Significant other observable inputs (Level 2) | Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		1.1
Significant other observable inputs (Level 2) | U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Significant other observable inputs (Level 2) | Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		1.0
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
Significant unobservable inputs (Level 3) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	$ 0.0	0.0
Significant unobservable inputs (Level 3) | Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Significant unobservable inputs (Level 3) | U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Significant unobservable inputs (Level 3) | Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		$ 0.0