Financial Derivatives and Hedging - Schedule of Fair Values of Derivative Instruments in Condensed Consolidated Balance Sheets (Details) - Designated as Hedging Instrument - Interest Rate Swap - USD ($) $ in Millions	Jan. 31, 2021	Jan. 31, 2020
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 11.2	$ 17.1
Other current liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	0.4	0.6
Other non-current liabilities
Derivatives, Fair Value [Line Items]
Interest rate swap contracts	$ 10.8	$ 16.5