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Disclosures About Derivative Instruments and Hedging Activities - Balance Sheet Location and Fair Value of Derivative Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Mar. 31, 2014 | Mar. 31, 2013
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Derivatives, Fair Value |  |
Derivative Asset, Fair Value, Net | $ 23.0 | $ 19.3
Derivative Liability, Fair Value, Net | (56.7) | (76.3)
Designated as Hedging Instrument |  |
Derivatives, Fair Value |  |
Derivative Asset, Fair Value, Net | 10.3 | 11.1
Derivative Liability, Fair Value, Net | (36.0) | (68.0)
Designated as Hedging Instrument | Cross Currency Interest Rate Contract |  |
Derivatives, Fair Value |  |
Derivative Asset, Fair Value, Net | 0 | 0
Derivative Financial Instruments and Other Assets | Designated as Hedging Instrument | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative Asset, Fair Value, Net | 10.2 | 5.4
Derivative Financial Instruments and Other Assets | Designated as Hedging Instrument | Foreign Currency Contracts |  |
Derivatives, Fair Value |  |
Derivative Asset, Fair Value, Net | 0.1 | 1.5
Derivative Financial Instruments and Other Assets | Derivatives Not Designated as Hedging Instruments | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative Asset, Fair Value, Net | 9.5 | 4.1
Derivative Financial Instruments, Assets | Designated as Hedging Instrument | Interest Rate Contracts |  |
Derivatives, Fair Value |  |
Derivative Asset, Fair Value, Net | 0 | 4.2
Derivative Financial Instruments, Assets | Derivatives Subject to Utility Rate Regulation | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative Asset, Fair Value, Net | 3.2 | 4.1
Derivative Financial Instruments and Other Noncurrent Liabilities | Designated as Hedging Instrument | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Net | (0.4) | (7.0)
Derivative Financial Instruments and Other Noncurrent Liabilities | Designated as Hedging Instrument | Foreign Currency Contracts |  |
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Net | (5.6) | (0.5)
Derivative Financial Instruments and Other Noncurrent Liabilities | Designated as Hedging Instrument | Cross Currency Interest Rate Contract |  |
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Net | (2.2) | 0
Derivative Financial Instruments and Other Noncurrent Liabilities | Designated as Hedging Instrument | Interest Rate Contracts |  |
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Net | (27.8) | (60.5)
Derivative Financial Instruments and Other Noncurrent Liabilities | Derivatives Subject to Utility Rate Regulation | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Net | (0.4) | (5.5)
Derivative Financial Instruments and Other Noncurrent Liabilities | Derivatives Not Designated as Hedging Instruments | Commodity Contracts |  |
Derivatives, Fair Value |  |
Derivative Liability, Fair Value, Net | $ (20.3) | $ (2.8)

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- Definition Fair value of 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, elected not to be offset against an obligation to return collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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- Definition Fair value of 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, elected not to be offset against a right to receive collateral under a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=20225523&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7476318&loc=d3e41678-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226011-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=28370219&loc=SL20226006-175313 + Details
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