Leases - Maturities of Operating and Finance Lease Liabilities After Adoption of 842 (Details) $ in Millions	Apr. 30, 2020 USD ($)
Operating Lease Liabilities
Remainder of fiscal 2020	$ 22.0
Fiscal 2021	40.3
Fiscal 2022	33.9
Fiscal 2023	28.7
Fiscal 2024	23.3
Thereafter	59.0
Total operating lease payments	207.1
Less: imputed interest	26.3
Present value of operating lease liabilities	180.8
Finance Lease Liabilities
Remainder of fiscal 2020	1.7
Fiscal 2021	2.9
Fiscal 2022	1.5
Fiscal 2023	0.8
Fiscal 2024	0.0
Thereafter	0.0
Total finance lease payments	6.9
Less: imputed interest	1.1
Present value of finance lease liabilities	5.8
Total
Remainder of fiscal 2020	23.7
Fiscal 2021	43.2
Fiscal 2022	35.4
Fiscal 2023	29.5
Fiscal 2024	23.3
Thereafter	59.0
Total lease payments	214.0
Less: imputed interest	27.4
Present value of lease liabilities	$ 186.6