Financial Instruments - Derivative Narrative (Details) - USD ($) $ in Millions	9 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Jan. 31, 2021
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net gain expected to be recognized in next 24 months	$ 14.2
Aoci including portion attributable to noncontrolling interest, period increase (decrease)	4.0
Other financing activities	(6.5)	$ (2.5)
Interest Rate Contract
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Other financing activities	4.0
Designated as Hedging Instrument
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	941.3		$ 1,140.0
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative, notional amount	$ 71.2		$ 434.5