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Fair Value Measurements - Level 3 Inputs (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward] |  |
Fair value at beginning of the period | $ 3.0 | $ 2.8
Included in earnings | (1.3) | 4.2
Settlements | 0.0 | 4.8
Transfers in | 0.0 | 0.9
Transfers out | 0.1 | 0.0
Fair value at end of period | 1.6 | 3.0
Gains for the period included in earnings attributable to the change in unrealized gains relating to derivatives still held at the reporting date | $ 1.6 | $ 2.6
Percent change in non-performance risk fair value input | 10.00% |

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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Net Asset (Liability), Gain (Loss) Included In Earnings + References No definition available. + Details
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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Net Asset (Liability), Transfer Into Level 3 + References No definition available. + Details
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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Net Asset (Liability), Transfers Out Of Level 3 + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Asset (Liability), Settlements + References No definition available. + Details
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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Net Asset (Liability), Value + References No definition available. + Details
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- Definition Fair Value, Unobservable Inputs, Non-Performance Risk, Effect on Income Before Income Taxes, Percentage Change In Input + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in other comprehensive income (loss) 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)(1a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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