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Fair Value Measurements (Assets and Liabilities Required to be Carried at Fair Value on a Recurring Basis) (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Millions | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | ---
Assets: |  |
Available-for-sale securities | $ 1.0 | $ 7.3
Forward exchange contracts | 2.3 | 0.3
Liabilities: |  |
Forward exchange contracts | (0.9) | (0.6)
Interest rate swaps | (35.1) | 0.0
Fair value, net asset (liability) | (32.7) | 7.0
Level 1 |  |
Assets: |  |
Available-for-sale securities | 1.0 | 7.3
Forward exchange contracts | 0.0 | 0.0
Liabilities: |  |
Forward exchange contracts | 0.0 | 0.0
Interest rate swaps | 0.0 | 0.0
Fair value, net asset (liability) | 1.0 | 7.3
Level 2 |  |
Assets: |  |
Available-for-sale securities | 0.0 | 0.0
Forward exchange contracts | 2.3 | 0.3
Liabilities: |  |
Forward exchange contracts | (0.9) | (0.6)
Interest rate swaps | (35.1) | 0.0
Fair value, net asset (liability) | $ (33.7) | $ (0.3)

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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=109250915&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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- Definition Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps. + References No definition available. + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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