Leases - Supplemental Information - (Details) $ in Millions	May 31, 2020 USD ($)
Leases [Abstract]
Operating lease ROU assets	$ 126.7
Finance lease ROU assets	125.2
Total leased assets	251.9
Current operating lease liabilities	34.2
Current finance lease liabilities	7.2
Noncurrent operating lease liabilities	96.3
Noncurrent finance lease liabilities	128.9
Total lease liabilities	$ 266.6
Operating leases, weighted-average remaining lease term (years)	5 years 9 months 18 days
Operating leases, weighted-average discount rate (percent)	2.20%
Finance leases, weighted-average remaining lease term (years)	14 years 4 months 24 days
Finance leases, weighted-average discount rate (percent)	3.30%