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Derivative Instruments and Hedging Activities (Derivatives by Balance Sheet Location) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Mar. 31, 2021
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 27.2	$ 50.8
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	2.1	1.5
Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	27.3	50.8
Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	2.6	2.6
Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	123.1	132.7
Interest rate swaps, financing element | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Financing element of certain hybrid instruments	93.1	98.2
Designated as Hedging Instrument | Forward exchange contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	2.1	1.5
Designated as Hedging Instrument | Forward exchange contracts | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0	0.0
Designated as Hedging Instrument | Forward exchange contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	2.6	2.6
Designated as Hedging Instrument | Forward exchange contracts | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0	0.0
Designated as Hedging Instrument | Interest rate swaps | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0	0.0
Designated as Hedging Instrument | Interest rate swaps | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	52.3	72.7
Designated as Hedging Instrument | Interest rate swaps | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0	0.0
Designated as Hedging Instrument | Interest rate swaps | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	7.7	5.6
Not Designated as Hedging Instrument | Interest rate swaps | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0	0.0
Not Designated as Hedging Instrument | Interest rate swaps | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	(25.0)	(21.9)
Not Designated as Hedging Instrument | Interest rate swaps | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0	0.0
Not Designated as Hedging Instrument | Interest rate swaps | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	115.4	127.1
Not Designated as Hedging Instrument | Interest rate swaps, financing element | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Financing element of certain hybrid instruments	93.1	98.2
Not Designated as Hedging Instrument | Interest rate swaps, financing element | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Financing element of certain hybrid instruments	$ 50.2	$ 54.3

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+ References

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