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Derivative Instruments and Hedging Activities (Derivatives by Balance Sheet Location) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Mar. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 9.9	$ 0.0
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	2.3	0.6
Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	9.9
Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	1.0	0.9
Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	177.4	187.9
Interest rate swaps, financing element | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Financing element of certain hybrid instruments	100.7
Designated as Hedging Instrument | Forward exchange contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	2.3	0.6
Designated as Hedging Instrument | Forward exchange contracts | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0
Designated as Hedging Instrument | Forward exchange contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	1.0	0.5
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	14.5
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	30.2	187.9
Not Designated as Hedging Instrument | Forward exchange contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset		0.0
Not Designated as Hedging Instrument | Forward exchange contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability		0.4
Not Designated as Hedging Instrument | Forward exchange contracts | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability		$ 0.0
Not Designated as Hedging Instrument | Interest rate swaps | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0
Not Designated as Hedging Instrument | Interest rate swaps | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	(4.6)
Not Designated as Hedging Instrument | Interest rate swaps | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0
Not Designated as Hedging Instrument | Interest rate swaps | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	147.2
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	100.7
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	$ 56.3

X

- Definition

Carrying value as of the balance sheet date of hybrid instruments.

+ References

No definition available.

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
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-URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
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+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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