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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Dec. 31, 2015
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Fair Value of Financial Instrument Assumptions [Line Items] |  |
Letters of Credit Potential Commitments, Amount | $ 36.4 | $ 42.5
First Amendment to New Unsecured Credit Facility [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 400.0 |
Warehousing Agreement - Second Amended and Restated [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Maximum Borrowing Capacity under MIF Warehousing Line | 125.0 |
Repurchase Agreement [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Maximum Borrowing Capacity under MIF Warehousing Line | $ 15.0 |

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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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