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Fair Value Disclosures - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative Credit Risk Valuation Adjustment, Derivative Assets | $ 0.0 | $ 0.1
Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets and Liabilities, Fair Value Disclosure | $ 5,500.0 | $ 4,900.0
Fair Value, Assets and Liabilities Fair Value as Percent of Total Assets | 31.00% | 31.00%
Fair Value, Assets and Liabilities, Fair Value as Percent of Total Financial Instruments Measured at Fair Value | 71.00% | 65.00%

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- Details
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