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Employee Benefit Plans (Details) - Schedule of net periodic costs - USD ($)
$ in Millions
 12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Other Postretirement Benefits [Member]      
Components of net periodic (benefit) cost:      
Service cost $ 0.0 $ 0.0 $ 0.0
Interest cost 0.8 0.8 0.9
Expected return on assets 0.0 0.0 0.0
Settlement charge 0.0 0.0 0.0
Amortization of net actuarial (gain) loss (0.1) 0.1 0.4
Net periodic (benefit) cost 0.7 0.9 1.3
U.S. [Member] | Pension Plans [Member]      
Components of net periodic (benefit) cost:      
Service cost   0.0 0.0
Interest cost   1.9 3.2
Expected return on assets   (4.1) (6.1)
Settlement charge   57.3 0.0
Amortization of net actuarial (gain) loss   0.9 0.9
Net periodic (benefit) cost 0.0 56.0 (2.0)
U.K. [Member] | Pension Plans [Member]      
Components of net periodic (benefit) cost:      
Service cost 0.0 0.0 0.0
Interest cost 0.9 1.1 1.2
Expected return on assets (1.0) (1.0) (1.0)
Settlement charge 0.0 0.0 0.0
Amortization of net actuarial (gain) loss 0.8 1.2 0.8
Net periodic (benefit) cost $ 0.7 $ 1.3 $ 1.0