Other Accrued Expenses - Schedule of accrued expenses (Details) - USD ($) $ in Millions	Nov. 30, 2017	May 31, 2017	Nov. 30, 2016
Schedule of accrued expenses [Abstract]
Accrued payroll, payroll taxes and benefits	$ 49.1	$ 48.5	$ 49.3
Accrued bonus and commissions	18.4	33.8	19.3
Accrued other taxes	28.8	26.1	33.9
Accrued advertising and promotions	37.4	34.9	37.3
Accrued insurance	8.0	7.6	7.8
Other accrued expenses	32.0	27.1	30.7
Total accrued expenses	$ 173.7	$ 178.0	$ 178.3