Other Accrued Expenses - Schedule of accrued expenses (Details) - USD ($) $ in Millions	Nov. 30, 2018	May 31, 2018	Nov. 30, 2017
Schedule of accrued expenses [Abstract]
Accrued payroll, payroll taxes and benefits	$ 42.3	$ 47.1	$ 49.1
Accrued bonus and commissions	16.8	22.4	18.4
Returns liability	78.7	0.0	0.0
Accrued other taxes	31.3	25.7	28.8
Accrued advertising and promotions	9.2	35.8	37.4
Accrued insurance	8.1	7.8	8.0
Other accrued expenses	41.4	39.1	32.0
Total accrued expenses	$ 227.8	$ 177.9	$ 173.7