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Debt - Collateralized Investment Borrowings (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Total | $ 778.7 | $ 909.0
Federal Home Loan Bank of Chicago | United Insurance Company of America |  |
Debt Instrument [Line Items] |  |
Due in One Year or Less | 107.8 |
Due after One Year to Two Years | 27.1 |
Due after Two Years | 2.7 |
Total | $ 137.6 |
Due in One Year or Less | Federal Home Loan Bank of Chicago | United Insurance Company of America |  |
Debt Instrument [Line Items] |  |
Weighted-average Interest Rate | 2.68% |
Due after One Year to Two Years | Federal Home Loan Bank of Chicago | United Insurance Company of America |  |
Debt Instrument [Line Items] |  |
Weighted-average Interest Rate | 2.73% |
Due after Two Years | Federal Home Loan Bank of Chicago | United Insurance Company of America |  |
Debt Instrument [Line Items] |  |
Weighted-average Interest Rate | 2.34% |

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