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Fair Value Measurements - Commodity and Foreign Currency Contracts (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Fair value measurement, additional disclosure |  |  |
Cash collateral deposits held by financial counterparties |  | $ 113.7 | $ 174.6
Cash collateral deposits held by financial counterparties, offset against liabilities |  | 77.7 | 132.2
Cash collateral deposits held by financial counterparties, not offset |  | 36.0 | 42.4
Cash collateral received from customers |  | 18.7 | 21.6
Commodity contracts |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net assets | [1] | 139.5 | 231.5
Total net liabilities | [1] | 61.3 | 74.1
Commodity contracts | Short-term derivative assets, net |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net assets | [1] | 127.5 | 212.6
Commodity contracts | Identifiable intangible and other non-current assets |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net assets | [1] | 12.0 | 18.9
Commodity contracts | Accrued expenses and other current liabilities |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net liabilities | [1] | 56.6 | 68.7
Commodity contracts | Other long-term liabilities |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net liabilities | [1] | 4.7 | 5.4
Foreign currency contracts |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net assets | [1] | 1.4 | 8.3
Total net liabilities | [1] | 3.7 | 0.9
Foreign currency contracts | Short-term derivative assets, net |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net liabilities | [1] | 1.1 | 7.6
Foreign currency contracts | Identifiable intangible and other non-current assets |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net assets | [1] | 0.3 | 0.7
Foreign currency contracts | Accrued expenses and other current liabilities |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net liabilities | [1] | 3.9 | $ 0.9
Foreign currency contracts | Other long-term liabilities |  |  |
Derivative instruments, at their respective fair value positions |  |  |
Total net liabilities | [1] | $ (0.1) |
[1] | Amounts may not add due to rounding

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- Definition Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 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 + Details
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- Definition Fair value, after offset of derivative liability, 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to 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 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 Reference 2: 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=51825145&loc=SL20226006-175313 Reference 3: 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=56946850&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -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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