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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Sep. 30, 2021 | Mar. 31, 2021
Derivative [Line Items] |  |
Remaining maturity of forward foreign exchange contracts, maximum | 16 years |
Interest rate swap cash flow hedge loss estimated to be reclassified into earnings during next 12 months | $ 47.4 |
Maximum |  |
Derivative [Line Items] |  |
Foreign currency cash flow hedge gains estimated to be reclassified into earnings during next 12 months | 0.1 |
Interest rate swaps |  |
Derivative [Line Items] |  |
Gross amount of swaps in an asset position subject to master netting arrangement | 173.0 | $ 211.2
Gross amount of swaps in an liability position subject to master netting arrangement | 218.3 | 236.3
Net asset of swaps subject to master netting arrangement | 27.2 | 50.8
Net liability of swaps subject to master netting arrangement | $ 72.5 | $ 75.9

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