Leases - Maturities of Operating and Finance Lease Liabilities After Adoption of 842 (Details) $ in Millions	Jan. 31, 2020 USD ($)
Operating Lease Liabilities
Remainder of fiscal 2020	$ 32.6
Fiscal 2021	38.9
Fiscal 2022	32.9
Fiscal 2023	27.8
Fiscal 2024	22.7
Thereafter	58.3
Total operating lease payments	213.2
Less: imputed interest	27.2
Present value of operating lease liabilities	186.0
Finance Lease Liabilities
Remainder of fiscal 2020	2.6
Fiscal 2021	2.9
Fiscal 2022	1.5
Fiscal 2023	0.8
Fiscal 2024	0.0
Thereafter	0.0
Total finance lease payments	7.8
Less: imputed interest	1.1
Present value of finance lease liabilities	6.7
Total
Remainder of fiscal 2020	35.2
Fiscal 2021	41.8
Fiscal 2022	34.4
Fiscal 2023	28.6
Fiscal 2024	22.7
Thereafter	58.3
Total lease payments	221.0
Less: imputed interest	28.3
Present value of lease liabilities	$ 192.7