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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) - USD ($) $ in Millions | Jun. 30, 2015 | Dec. 31, 2014
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Fair Value of Financial Instrument Assumptions [Line Items] |  |
Letters of Credit Potential Commitments, Amount | $ 32.2 | $ 33.6
First Amendment to New Unsecured Credit Facility [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Line of Credit Facility, Current Borrowing Capacity | 300.0 |
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 M/I Financial Maximum Borrowing Capacity + References No definition available. + Details
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- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any 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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