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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Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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Fair value of asset associated with financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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