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Insurance Subsidiary - Financial Information Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Apr. 06, 2011
Statutory Accounting Practices [Line Items] |  |  |  |  |
Dividends Declared But Not Paid | $ 107.3 |  |  |  |
Payments of Dividends | $ 25.0 | $ 132.3 |  |  |
Statutory Accounting Practices, Statutory Capital and Surplus, Unassigned Balance Netted Against Additional Paid in Capital |  |  |  |  | $ 805.8
Statutory Accounting Practices, Statutory Capital and Surplus, Increase (Decrease) as a Result of ReDomestication by Entity |  |  | $ 4.0 | $ 4.1 |
Statutory Accounting Practices, Non-Permitted Practice, Change in Statutory Capital and Surplus |  |  | 8.3 | (13.7) |
Document Period End Date | Sep. 30, 2017 |  |  |  |
IOWA |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Statutory Accounting Practices, Permitted Practice, Change in Statutory Capital and Surplus |  |  | 0.1 | 46.8 |
Raven Re [Member] |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Statutory Accounting Practices Statutory Capital And Surplus Change |  |  | 195.0 | 220.0 |
Statutory Accounting Practices, Statutory Capital and Surplus, Balance |  |  | $ 207.3 | $ 210.3 |
Non Agency Residential Mortgage Backed Securities [Member] |  |  |  |  |
Statutory Accounting Practices [Line Items] |  |  |  |  |
Other Marketable Securities, Current | $ 19,765.4 | $ 18,074.6 |  |  |

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