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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) $ in Millions | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Fair Value of Financial Instrument Assumptions [Line Items] |  |
Letters of Credit Potential Commitments, Amount | $ 48.8 | $ 49.7
Second Amendment to Credit Facility [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 500.0 |
Basis Points Spread on Variable Rate - Credit Facility | 250 |
Warehousing Agreement - Second Amendment to Second Amended and Restated [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
M/I Financial Maximum Borrowing Capacity | $ 125.0 |
M/I Financial Temporary Increase Maximum Borrowing Capacity | 160.0 |
Repurchase Agreement - Amendment No. 4 [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
M/I Financial Maximum Borrowing Capacity | 35.0 |
M/I Financial Temporary Increase Maximum Borrowing Capacity | $ 50.0 |

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- Definition Basis points added to the reference rate to compute the variable rate on the credit facility borrowings. + References No definition available. + Details
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- Definition [Line Items] for Fair Value of Financial Instrument Assumptions [Table] + References No definition available. + Details
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- Definition M/I Financial Maximum Borrowing Capacity + References No definition available. + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -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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