v3.8.0.1

Fair Value Measurement - Fair Value of Assets (Liabilities) Not Measured at Fair Value In Consolidated Balance Sheet - Additional Information (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Fixed-Rate Long-Term Debt |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Long term debt, carrying value | $ 265.0 | $ 350.0
Variable Interest Entity, Not Primary Beneficiary |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Investments, present value of estimated future cash flows | 120.00% |

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- Details
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