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Fair Value Measurements and Derivative Instruments (Credit Features) (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 derivative | Dec. 31, 2016 USD ($) derivative
Derivative instruments disclosure |  |
Number of derivatives, matured | derivative | 4 | 2
Collateral posted | $ |  | $ 7.2
Standard & Poor's, BBB- Rating | Lower Limit |  |
Derivative instruments disclosure |  |
Credit ratings for senior debt | BBB- |
Standard & Poor's, BB Rating |  |
Derivative instruments disclosure |  |
Credit ratings for senior debt | BBB- |
Moody's, Baa3 Rating |  |
Derivative instruments disclosure |  |
Credit ratings for senior debt | Baa3 |
Moody's, Ba1 Rating |  |
Derivative instruments disclosure |  |
Credit ratings for senior debt | Baa3 |

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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624258-113959 + Details
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