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Retirement Benefits and Postemployment Benefits (Schedule of fair values of benefit plan assets and their respective levels in fair value heirarchy) (Details) - USD ($)
$ in Millions
May 30, 2021
May 31, 2020
May 26, 2019
Defined Benefit Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets $ 7,460.2 $ 6,993.2 $ 6,291.6
Defined Benefit Pension Plans [Member] | Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 1,535.5 1,817.3  
Defined Benefit Pension Plans [Member] | Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 3,929.8 3,500.7  
Defined Benefit Pension Plans [Member] | Real asset investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 278.1 223.5  
Defined Benefit Pension Plans [Member] | Other investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.1 0.2  
Defined Benefit Pension Plans [Member] | Cash and accruals [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 180.0 180.3  
Defined Benefit Pension Plans [Member] | Assets measured at net asset value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 1,536.7 1,271.2  
Defined Benefit Pension Plans [Member] | Fair value measurement of pension plan assets in the fair value hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 5,923.5 5,722.0  
Defined Benefit Pension Plans [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 3,289.7 3,276.6  
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 838.3 1,039.6  
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 1,993.5 1,833.3  
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Real asset investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 277.9 223.4  
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Other investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Defined Benefit Pension Plans [Member] | Level 1 [Member] | Cash and accruals [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 180.0 180.3  
Defined Benefit Pension Plans [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 2,633.7 2,445.2  
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 697.2 777.7  
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 1,936.3 1,667.4  
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Real asset investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.2 0.1  
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Other investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Defined Benefit Pension Plans [Member] | Level 2 [Member] | Cash and accruals [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Defined Benefit Pension Plans [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.1 0.2  
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Real asset investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Other investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.1 0.2  
Defined Benefit Pension Plans [Member] | Level 3 [Member] | Cash and accruals [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Other Postretirement Benefit Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 519.4 793.5 $ 753.8
Other Postretirement Benefit Plans [Member] | Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.2 46.9  
Other Postretirement Benefit Plans [Member] | Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 117.3 425.9  
Other Postretirement Benefit Plans [Member] | Real asset investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.1  
Other Postretirement Benefit Plans [Member] | Cash and accruals [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 14.8 16.7  
Other Postretirement Benefit Plans [Member] | Assets measured at net asset value [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 387.1 303.9  
Other Postretirement Benefit Plans [Member] | Fair value measurement of pension plan assets in the fair value hierarchy [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 132.3 489.6  
Other Postretirement Benefit Plans [Member] | Level 1 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 132.3 174.3  
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.2 0.0  
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 117.3 157.5  
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Real asset investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.1  
Other Postretirement Benefit Plans [Member] | Level 1 [Member] | Cash and accruals [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 14.8 16.7  
Other Postretirement Benefit Plans [Member] | Level 2 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 315.3  
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 46.9  
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 268.4  
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Real asset investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Other Postretirement Benefit Plans [Member] | Level 2 [Member] | Cash and accruals [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Other Postretirement Benefit Plans [Member] | Level 3 [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Equity [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Fixed income [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Real asset investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets 0.0 0.0  
Other Postretirement Benefit Plans [Member] | Level 3 [Member] | Cash and accruals [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Fair value measurement of pension plan assets $ 0.0 $ 0.0