Fair Value Measurements (Fair Values Of Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	May 27, 2018	May 28, 2017
Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	$ 0.0	$ 2.0
Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	1.1	1.7
Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	0.0
Corporate bonds | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Corporate bonds | Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		1.1
Corporate bonds | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
U.S. Treasury securities | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		2.0
U.S. Treasury securities | Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
U.S. Treasury securities | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Mortgage-backed securities | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Mortgage-backed securities | Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		1.0
Mortgage-backed securities | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		0.0
Commodities futures, swaps & options | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0
Commodities futures, swaps & options | Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.5
Commodities futures, swaps & options | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0
Equity forwards | Quoted Prices in Active Market for Identical Assets (Liabilities) (Level 1)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	0.0
Equity forwards | Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.6	(0.4)
Equity forwards | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0	0.0
Fair Value of Assets (Liabilities)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	1.1	3.7
Fair Value of Assets (Liabilities) | Corporate bonds
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		1.1
Fair Value of Assets (Liabilities) | U.S. Treasury securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		2.0
Fair Value of Assets (Liabilities) | Mortgage-backed securities
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Fixed-income securities		1.0
Fair Value of Assets (Liabilities) | Commodities futures, swaps & options
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.5
Fair Value of Assets (Liabilities) | Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	$ 0.6	$ (0.4)