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Employee Benefit Plans (Details) - Schedule of impact on earnings of reclassifications out of Accumulated other comprehensive income (loss) - USD ($)
$ in Millions
 12 Months Ended
May. 31, 2015
May. 31, 2014
May. 31, 2013
Pension Plans [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 0.0 $ 0.0 $ 0.0
Net amortization and deferrals 0.0 0.0 0.0
Lump sum settlement charge 4.3 1.7 0.0
Recognized net actuarial loss 1.4 1.8 2.2
Amounts reclassified from Accumulated other comprehensive income (loss) 5.7 3.5 2.2
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 0.0 0.0 0.0
Net amortization and deferrals (0.2) (0.2) (0.4)
Lump sum settlement charge 0.0 0.0 0.0
Recognized net actuarial loss 1.3 2.2 3.0
Amounts reclassified from Accumulated other comprehensive income (loss) $ 1.1 $ 2.0 $ 2.6