Employee Benefit Plans (Details) - Schedule of net periodic costs - USD ($) $ in Millions	12 Months Ended
	May 31, 2020	May 31, 2019	May 31, 2018
Components of net periodic (benefit) cost:
Settlement charge			$ 57.3
Other Postretirement Benefits [Member]
Components of net periodic (benefit) cost:
Service cost	$ 0.0	$ 0.0	0.0
Interest cost	0.6	0.8	0.8
Expected return on assets	0.0	0.0	0.0
Settlement charge	0.0	0.0	0.0
Amortization of net actuarial (gain) loss	(0.2)	(0.1)	(0.1)
Net periodic (benefit) cost	0.4	0.7	0.9
U.S. [Member] | Pension Plans [Member]
Components of net periodic (benefit) cost:
Service cost			0.0
Interest cost			1.9
Expected return on assets			(4.1)
Settlement charge			57.3
Amortization of net actuarial (gain) loss			0.9
Net periodic (benefit) cost	0.0	0.0	56.0
U.K. [Member] | Pension Plans [Member]
Components of net periodic (benefit) cost:
Service cost	0.0	0.0	0.0
Interest cost	0.9	0.9	1.1
Expected return on assets	(1.0)	(1.0)	1.0
Settlement charge	0.0	0.0	0.0
Amortization of net actuarial (gain) loss	1.0	0.8	(1.2)
Net periodic (benefit) cost	$ 0.9	$ 0.7	$ 1.3