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Employee Benefit Plans (Details) - Schedule of expected future benefit payments (USD $)
In Millions, unless otherwise specified
May 31, 2014
Pension Plans [Member]
 
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2015 $ 15.5
2016 11.8
2017 11.1
2018 10.8
2019 11.0
2020-2024 50.7
Other Postretirement Benefits [Member] | Benefit Payments [Member]
 
Defined Benefit Plan, Expected Future Benefit Payments, Fiscal Year Maturity [Abstract]  
2015 2.9
2016 2.8
2017 2.8
2018 2.7
2019 2.6
2020-2024 12.5
Other Postretirement Benefits [Member] | Medicare Subsidy Receipts [Member]
 
Medicare Subsidy Receipts  
2015 0.3
2016 0.3
2017 0.3
2018 0.3
2019 0.3
2020-2024 $ 1.6