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Summary of Significant Accounting Policies Losses, Claims and Settlement Expenses - RFIG Run-off (Details) - RFIG Run-off Business [Member] - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Supplementary Insurance Information, by Segment      
Total incurred claims and settlement expenses reduced (increased) by changes in estimated rescissions, Current year $ 0.4 $ 0.6 $ 0.9
Total incurred claims and settlement expenses reduced (increased) by changes in estimated rescissions, Prior year 0.0 (0.9) (12.3)
Total incurred claims and settlement expenses reduced (increased) by changes in estimated rescissions, Sub-total 0.3 (0.3) (11.4)
Estimated rescission reduction in settled claims $ (0.7) $ (1.3) $ (4.4)