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Employee Benefit Plans (Details) - Schedule of change in fair value of plan assets - USD ($)
$ in Millions
 12 Months Ended
Feb. 14, 2018
May 31, 2019
May 31, 2018
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   0.0 2.0
Settlement   0.0 0.0
Benefits paid, including expenses   0.0 (2.4)
Plan participants’ contributions   0.0 0.4
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   32.4  
Settlement   0.0 0.0
Fair value of plan assets at end of year   31.8 32.4
U.S. [Member] | Pension Plans [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of year   1.6 132.5
Actual return on plan assets     0.5
Employer contributions     0.0
Settlement $ (86.3)   (125.2)
Benefits paid, including expenses     (6.2)
Plan participants’ contributions     0.0
Foreign currency translation     0.0
Fair value of plan assets at end of year   0.0 1.6
U.K. [Member] | Pension Plans [Member]      
Change in plan assets:      
Fair value of plan assets at beginning of year   30.8 29.2
Actual return on plan assets   2.8 1.7
Employer contributions   1.0 1.1
Benefits paid, including expenses   (1.2) (2.1)
Plan participants’ contributions   0.0 0.0
Foreign currency translation   (1.6) 0.9
Fair value of plan assets at end of year   $ 31.8 $ 30.8