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Derivative Instruments and Hedging Activities - Fair Value of Derivative Assets and Liabilities (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Mar. 31, 2015
--- | --- | ---
Derivative assets: |  |
Derivative asset, gross | $ 48.6 | $ 67.8
Gross amounts offset in the balance sheet | (26.4) | (13.8)
Total derivative assets - net | 22.2 | 54.0
Derivative liabilities: |  |
Derivative liability, gross | (117.1) | (180.8)
Gross amounts offset in the balance sheet | 26.4 | 13.8
Cash collateral pledged | 0.1 | 3.7
Total derivative liabilities - net | (90.6) | (163.3)
Designated as Hedging Instrument |  |
Derivative assets: |  |
Derivative asset, gross | 11.6 | 45.6
Derivative liabilities: |  |
Derivative liability, gross | (9.7) | (12.5)
Designated as Hedging Instrument | Foreign currency contracts |  |
Derivative assets: |  |
Derivative asset, gross | 11.6 | 35.8
Derivative liabilities: |  |
Derivative liability, gross | (5.0) | 0.0
Designated as Hedging Instrument | Cross-currency contracts |  |
Derivative assets: |  |
Derivative asset, gross | 0.0 | 9.7
Derivative liabilities: |  |
Derivative liability, gross | (1.3) | 0.0
Designated as Hedging Instrument | Interest rate contracts |  |
Derivative assets: |  |
Derivative asset, gross | 0.0 | 0.1
Derivative liabilities: |  |
Derivative liability, gross | (3.4) | (12.5)
Derivatives Subject To PGC and DS Mechanisms | Commodity contracts |  |
Derivative assets: |  |
Derivative asset, gross | 1.2 | 0.0
Derivative liabilities: |  |
Derivative liability, gross | (3.5) | (5.2)
Derivatives Not Designated as Hedging Instruments | Commodity contracts |  |
Derivative assets: |  |
Derivative asset, gross | 35.8 | 22.2
Derivative liabilities: |  |
Derivative liability, gross | $ (103.9) | $ (163.1)

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- Definition Fair value of liability associated with 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226003-175313 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959 + Details
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