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Fair Value Measurements - Level 3 Inputs (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2016 | Mar. 31, 2015
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |  |
Transfer of assets from Level 1 to Level 2 |  | $ 0.0 | $ 0.0
Transfer of assets from Level 2 to Level 1 |  | 0.0 | 0.0
Transfer of liabilities from Level 1 to Level 2 |  | 0.0 | 0.0
Transfer of liabilities from Level 2 to Level 1 |  | 0.0 | 0.0
Commodity contracts | Revenue |  |  |
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |  |
Beginning of Period | [1] | 2.8 | 4.2
Total Gains (Losses) Included in Earnings | [1] | 0.2 | 0.8
Settlements | [1] | 1.4 | 3.7
Transfers into Level 3 | [1] | 1.3 |
End of Period | [1] | 3.0 | 1.3
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period | [1] | 1.3 | (0.4)
Commodity contracts | Cost of revenue. |  |  |
Change in fair value of assets and liabilities measured on recurring basis, utilized Level 3 inputs |  |  |
Beginning of Period | [1] | 0.2 | 1.3
Total Gains (Losses) Included in Earnings | [1] | 0.1 | 0.5
Settlements | [1] |  | 0.5
End of Period | [1] | $ 0.3 | 0.3
Change in Unrealized Gains Relating to Assets (Liabilities) that are Held at end of Period | [1] |  | $ 0.8
[1] | Amounts may not add due to rounding

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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of gain (loss) recognized on the income statement for financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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