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PENSION AND POSTRETIREMENT BENEFITS (Fair Value Hierarchy) (Details) (USD $)
In Millions, unless otherwise specified
May 26, 2013
May 27, 2012
Fair value of Plan assets    
Total Assets $ 3,343.3 $ 2,766.6
Level 1
    
Fair value of Plan assets    
Total Assets 1,682.1 1,354.7
Level 2
    
Fair value of Plan assets    
Total Assets 1,068.9 883.8
Level 3
    
Fair value of Plan assets    
Total Assets 592.3 528.1
Cash and cash equivalents
    
Fair value of Plan assets    
Total Assets 195.8 321.6
Cash and cash equivalents | Level 1
    
Fair value of Plan assets    
Total Assets 1.0 1.8
Cash and cash equivalents | Level 2
    
Fair value of Plan assets    
Total Assets 194.8 319.8
U.S. equity securities
    
Fair value of Plan assets    
Total Assets 856.9 623.5
U.S. equity securities | Level 1
    
Fair value of Plan assets    
Total Assets 766.9 616.2
U.S. equity securities | Level 2
    
Fair value of Plan assets    
Total Assets 90.0 7.3
International equity securities
    
Fair value of Plan assets    
Total Assets 726.7 521.8
International equity securities | Level 1
    
Fair value of Plan assets    
Total Assets 513.3 395.1
International equity securities | Level 2
    
Fair value of Plan assets    
Total Assets 213.4 126.7
Government bonds
    
Fair value of Plan assets    
Total Assets 289.5 260.5
Government bonds | Level 1
    
Fair value of Plan assets    
Total Assets 108.7 99.9
Government bonds | Level 2
    
Fair value of Plan assets    
Total Assets 180.8 160.6
Corporate bonds
    
Fair value of Plan assets    
Total Assets 328.4 208.6
Corporate bonds | Level 1
    
Fair value of Plan assets    
Total Assets 35.3 9.5
Corporate bonds | Level 2
    
Fair value of Plan assets    
Total Assets 293.1 199.1
Mortgage-backed bonds
    
Fair value of Plan assets    
Total Assets 140.2 152.7
Mortgage-backed bonds | Level 1
    
Fair value of Plan assets    
Total Assets 57.1 82.4
Mortgage-backed bonds | Level 2
    
Fair value of Plan assets    
Total Assets 83.1 70.3
Real estate funds
    
Fair value of Plan assets    
Total Assets 114.1 88.9
Real estate funds | Level 1
    
Fair value of Plan assets    
Total Assets 8.9 5.7
Real estate funds | Level 2
    
Fair value of Plan assets    
Total Assets 13.7  
Real estate funds | Level 3
    
Fair value of Plan assets    
Total Assets 91.5 83.2
Multi-strategy hedge funds
    
Fair value of Plan assets    
Total Assets 413.9 379.1
Multi-strategy hedge funds | Level 3
    
Fair value of Plan assets    
Total Assets 413.9 379.1
Private equity
    
Fair value of Plan assets    
Total Assets 79.1 64.2
Private equity | Level 3
    
Fair value of Plan assets    
Total Assets 79.1 64.2
Master limited partnerships
    
Fair value of Plan assets    
Total Assets 180.6 137.5
Master limited partnerships | Level 1
    
Fair value of Plan assets    
Total Assets 180.6 137.5
Private energy funds
    
Fair value of Plan assets    
Total Assets 7.8 1.6
Private energy funds | Level 3
    
Fair value of Plan assets    
Total Assets 7.8 1.6
Net receivables for unsettled transactions
    
Fair value of Plan assets    
Total Assets 10.3 6.6
Net receivables for unsettled transactions | Level 1
    
Fair value of Plan assets    
Total Assets $ 10.3 $ 6.6