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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

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