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Employee Benefit Plans (Details) - Schedule of net periodic costs - USD ($)
$ in Millions
 12 Months Ended
May 31, 2017
May 31, 2016
May 31, 2015
Components of net periodic (benefit) cost:      
Service cost $ 0.1 $ 0.1  
Other Postretirement Benefits [Member]      
Components of net periodic (benefit) cost:      
Service cost 0.0 0.0 $ 0.0
Interest cost 0.9 1.4 1.3
Expected return on assets 0.0 0.0 0.0
Net amortization and deferrals 0.0 (0.1) (0.2)
Lump sum settlement charge 0.0 0.0 0.0
Amortization of net actuarial loss 0.4 2.8 1.3
Net periodic (benefit) cost 1.3 4.1 2.4
U.S. [Member] | Pension Plans [Member]      
Components of net periodic (benefit) cost:      
Service cost 0.0 0.0 0.0
Interest cost 3.2 4.6 5.0
Expected return on assets (6.1) (6.5) (7.8)
Net amortization and deferrals 0.0 0.0 0.0
Lump sum settlement charge 0.0 0.0 4.3
Amortization of net actuarial loss 0.9 0.8 0.7
Net periodic (benefit) cost (2.0) (1.1) 2.2
U.K. [Member] | Pension Plans [Member]      
Components of net periodic (benefit) cost:      
Service cost 0.0 0.0 0.0
Interest cost 1.2 1.5 1.7
Expected return on assets (1.0) (1.3) (1.5)
Net amortization and deferrals 0.0 0.0 0.0
Lump sum settlement charge 0.0 0.0 0.0
Amortization of net actuarial loss 0.8 0.9 0.7
Net periodic (benefit) cost $ 1.0 $ 1.1 $ 0.9