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Fair Value Measurements Fair Value of Financial Instrument Assumptions (Details) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value of Financial Instrument Assumptions [Line Items] |  |
Letters of Credit Potential Commitments, Amount | $ 41.4 | $ 37.7
Second Amendment to Credit Facility [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
Line of Credit Facility, Maximum Borrowing Capacity | 475.0 |
Warehousing Agreement - First 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 | 150.0 |
Repurchase Agreement - Amendment No. 4 [Member] |  |
Fair Value of Financial Instrument Assumptions [Line Items] |  |
M/I Financial Maximum Borrowing Capacity | $ 35.0 |

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