Other Accrued Expenses - Schedule of accrued expenses (Details) - USD ($) $ in Millions	Feb. 28, 2019	May 31, 2018	Feb. 28, 2018
Schedule of accrued expenses [Abstract]
Accrued payroll, payroll taxes and benefits	$ 45.2	$ 47.1	$ 44.8
Accrued bonus and commissions	13.0	22.4	19.9
Returns liability	97.3	0.0	0.0
Accrued other taxes	23.5	25.7	23.4
Accrued advertising and promotions	10.2	35.8	35.8
Accrued insurance	8.5	7.8	8.1
Other accrued expenses	38.5	39.1	30.6
Total accrued expenses	$ 236.2	$ 177.9	$ 162.6