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PENSION AND POSTRETIREMENT BENEFITS (Benefit Obligations) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
May. 31, 2015 | May. 25, 2014 | May. 26, 2013
Pension Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net actuarial gain (loss) | $ (143.8) | $ 12.7 |
Amendments | (0.6) | (2.2) |
Amortization of prior service cost (benefit) | 5.2 | 3.8 |
Recognized net actuarial loss | 6.9 | 2.7 | $ 3.6
Net amount recognized | (132.3) | 17.0 |
Other Benefits |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Net actuarial gain (loss) | 35.8 | 4.9 |
Amendments | 3.3 | 5.7 |
Amortization of prior service cost (benefit) | (7.9) | (7.2) |
Recognized net actuarial loss | 3.5 | 6.7 | $ 5.9
Net amount recognized | $ 34.7 | $ 10.1 |

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