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Employee Benefit Plans (Details) - Schedule of net periodic costs - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2015
Nov. 30, 2014
Nov. 30, 2015
Nov. 30, 2014
Components of net periodic benefit (credit) cost:        
Amortization of (gain) loss     $ 2.2 $ 4.9
Pension Plans        
Components of net periodic benefit (credit) cost:        
Service cost $ 0.0 $ 0.0 0.0 0.0
Interest cost 1.6 1.7 3.1 3.4
Expected return on assets (2.0) (2.2) (3.9) (4.7)
Net amortization of prior service credit 0.0 0.0 0.0 0.0
Benefit cost of settlement event 0.0 3.7 0.0 3.7
Amortization of (gain) loss 0.4 0.4 0.8 0.7
Net periodic benefit (credit) cost 0.0 3.6 0.0 3.1
Post-Retirement Benefits        
Components of net periodic benefit (credit) cost:        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.4 0.3 0.7 0.6
Expected return on assets 0.0 0.0 0.0 0.0
Net amortization of prior service credit 0.0 0.0 0.0 0.0
Benefit cost of settlement event 0.0 0.0 0.0 0.0
Amortization of (gain) loss 0.8 0.3 1.4 0.7
Net periodic benefit (credit) cost $ 1.2 $ 0.6 $ 2.1 $ 1.3