Fair Value Measurements - Fair Values Of Financial Instruments Measured At Fair Value On Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions	May 31, 2020	May 26, 2019
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	$ 4.4	$ (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
Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	4.4	(0.8)
Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Total	0.0	0.0
Commodity contracts
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(1.8)
Commodity contracts | 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
Commodity contracts | Significant Other Observable Inputs (Level 2)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	(1.8)
Commodity contracts | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	0.0
Equity forwards
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	6.2	(0.8)
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	6.2	(0.8)
Equity forwards | Significant Unobservable Inputs (Level 3)
Fair Value Assets and Liabilities Measured On Recurring Basis [Line Items]
Derivatives	$ 0.0	$ 0.0