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Fair Value Measurements and Derivative Instruments - Credit Features (Details) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 derivative | Dec. 31, 2016 USD ($) derivative
Derivative Instruments |  |
Number of derivatives matured | derivative | 4 | 2
Posted collateral | $ |  | $ 7.2
Moody's, Baa3 Rating |  |
Derivative Instruments |  |
Credit ratings for senior debt | Baa3 |
Moody's, Ba1 Rating |  |
Derivative Instruments |  |
Credit ratings for senior debt | Baa3 |
Standard & Poor's, BBB- Rating | Minimum |  |
Derivative Instruments |  |
Credit ratings for senior debt | BBB- |
Standard & Poor's, BB Plus Rating |  |
Derivative Instruments |  |
Credit ratings for senior debt | BBB- |

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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=6928386&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 The fair value as of the balance sheet date of financial instruments and other positions owned by the entity and pledged to counterparties as collateral, including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66007379&loc=d3e113888-111728 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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