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Employee Benefit Plans - Schedule of net periodic costs (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Feb. 28, 2018
Feb. 28, 2017
Feb. 28, 2018
Feb. 28, 2017
Components of net periodic benefit (credit) cost:        
Amortization of (gain) loss     $ 1.8 $ 3.1
Post-Retirement Benefits        
Components of net periodic benefit (credit) cost:        
Service cost $ 0.0 $ 0.0 0.0 0.0
Interest cost 0.2 0.2 0.7 0.8
Expected return on assets 0.0 0.0 0.0 0.0
Net amortization of prior service credit     0.0 0.0
Benefit cost of settlement event 0.0 0.0 0.0 0.0
Amortization of (gain) loss 0.0 (1.0) 0.0 0.2
Net periodic benefit (credit) cost 0.2 (0.8) 0.7 1.0
United States | Pension Plans        
Components of net periodic benefit (credit) cost:        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.5 0.8 1.9 2.4
Expected return on assets (1.1) (1.5) (4.0) (4.6)
Net amortization of prior service credit     0.0 0.0
Benefit cost of settlement event 39.6 0.0 55.0 0.0
Amortization of (gain) loss 0.3 0.2 0.9 0.7
Net periodic benefit (credit) cost 39.3 (0.5) 53.8 (1.5)
United Kingdom | Pension Plans        
Components of net periodic benefit (credit) cost:        
Service cost 0.0 0.0 0.0 0.0
Interest cost 0.3 0.3 0.8 0.9
Expected return on assets (0.3) (0.3) (0.8) (0.8)
Net amortization of prior service credit     0.0 0.0
Benefit cost of settlement event 0.0 0.0 0.0 0.0
Amortization of (gain) loss 0.3 0.2 0.9 0.6
Net periodic benefit (credit) cost $ 0.3 $ 0.2 $ 0.9 $ 0.7