Leases - Supplemental Information - (Details) $ in Millions	Aug. 31, 2020 USD ($)
Leases [Abstract]
Operating lease ROU assets	$ 121.3
Finance lease ROU assets	124.3
Total leased assets	245.6
Current operating lease liabilities	33.6
Current finance lease liabilities	7.3
Noncurrent operating lease liabilities	91.4
Noncurrent finance lease liabilities	127.3
Total lease liabilities	$ 259.6
Operating leases, weighted-average remaining lease term (years)	5 years 8 months 12 days
Operating leases, weighted-average discount rate (percent)	2.10%
Finance leases, weighted-average remaining lease term (years)	14 years 3 months 18 days
Finance leases, weighted-average discount rate (percent)	3.30%