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Financial Instruments (Derivatives by Balance Sheet Location) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Mar. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative Asset	$ 50.8	$ 0.0
Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	1.5	0.6
Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	50.8
Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	2.6	0.9
Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	132.7	187.9
Interest Rate Swap, Financing | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Financing element of certain hybrid instruments	98.2
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	1.5	0.6
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0
Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	2.6	0.5
Designated as Hedging Instrument | Foreign Exchange Contracts | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0	0.0
Designated as Hedging Instrument | Interest Rate Swap | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0	0.0
Designated as Hedging Instrument | Interest Rate Swap | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	72.7
Designated as Hedging Instrument | Interest Rate Swap | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0	0.0
Designated as Hedging Instrument | Interest Rate Swap | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	5.6	187.9
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset		0.0
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability		0.4
Not Designated as Hedging Instrument | Foreign Exchange Contracts | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability		$ 0.0
Not Designated as Hedging Instrument | Interest Rate Swap | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	0.0
Not Designated as Hedging Instrument | Interest Rate Swap | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset	(21.9)
Not Designated as Hedging Instrument | Interest Rate Swap | Accounts Payable and Accrued Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	0.0
Not Designated as Hedging Instrument | Interest Rate Swap | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability	127.1
Not Designated as Hedging Instrument | Interest Rate Swap, Financing | Other Non-Current Assets
Derivatives, Fair Value [Line Items]
Financing element of certain hybrid instruments	98.2
Not Designated as Hedging Instrument | Interest Rate Swap, Financing | Other Non-Current Liabilities
Derivatives, Fair Value [Line Items]
Financing element of certain hybrid instruments	$ 54.3

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- 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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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Topic 825
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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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