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Derivative Instruments and Hedging Activities (Derivatives by Balance Sheet Location) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Mar. 31, 2020
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Designated as Hedging Instrument | Other Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | $ 0.4 | $ 0.6
Designated as Hedging Instrument | Accounts Payable and Accrued Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 0.7 | 0.9
Designated as Hedging Instrument | Other Non-Current Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 192.6 | 187.9
Designated as Hedging Instrument | Forward exchange contracts | Other Current Assets |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 0.4 | 0.6
Designated as Hedging Instrument | Forward exchange contracts | Accounts Payable and Accrued Liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | 0.7 | 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 | 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 | 36.0 | 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 | 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 | 156.6 |
Not Designated as Hedging Instrument | Interest rate swaps, financing element |  |
Derivatives, Fair Value [Line Items] |  |
Financing Element of Certain Hybrid Instruments | $ 161.5 |

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- Definition Carrying value as of the balance sheet date of hybrid instruments. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other 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 assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -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 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 + Details
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- Definition Fair value, after the 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 not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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