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

Number of Derivatives, Matured

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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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- Definition

Description of the credit rating indicative of likelihood of repayment of the debt instrument given by a credit rating agency (for example, Standard and Poor's, Moody's, Fitch).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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