Employee Benefit Plans (Details) - Schedule of change in fair value of plan assets - USD ($) $ in Millions	12 Months Ended
	May 31, 2017	May 31, 2016
Other Postretirement Benefits [Member]
Change in plan assets:
Fair value of plan assets at beginning of year	$ 0.0	$ 0.0
Actual return on plan assets	0.0	0.0
Employer contributions	2.2	2.4
Benefits paid, including expenses	(2.4)	(2.7)
Plan participants’ contributions	0.2	0.3
Foreign currency translation	0.0	0.0
Fair value of plan assets at end of year	0.0	0.0
Pension Plans [Member]
Change in plan assets:
Fair value of plan assets at beginning of year	164.2
Fair value of plan assets at end of year	161.7	164.2
U.S. [Member] | Pension Plans [Member]
Change in plan assets:
Fair value of plan assets at beginning of year	135.1	143.2
Actual return on plan assets	7.0	2.6
Employer contributions	0.0	0.0
Benefits paid, including expenses	(9.6)	(10.7)
Plan participants’ contributions	0.0	0.0
Foreign currency translation	0.0	0.0
Fair value of plan assets at end of year	132.5	135.1
U.K. [Member] | Pension Plans [Member]
Change in plan assets:
Fair value of plan assets at beginning of year	29.1	30.5
Actual return on plan assets	3.5	0.0
Employer contributions	1.1	1.3
Benefits paid, including expenses	(1.3)	(1.0)
Plan participants’ contributions	0.0	0.0
Foreign currency translation	(3.2)	(1.7)
Fair value of plan assets at end of year	$ 29.2	$ 29.1