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Supplementary Financial Information - Schedule of Other Invested Assets (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Summary of Investment Holdings [Line Items] |  |
Measurement Alternative | $ 11.8 | $ 11.8
Equity Method | 41.3 | 43.6
Total | 53.1 | 55.4
Common stock |  |
Summary of Investment Holdings [Line Items] |  |
Measurement Alternative | 0.0 | 0.0
Equity Method | 2.5 | 2.5
Total | 2.5 | 2.5
Preferred stock |  |
Summary of Investment Holdings [Line Items] |  |
Measurement Alternative | 0.0 | 0.0
Equity Method | 12.1 | 15.4
Total | 12.1 | 15.4
Fixed maturities |  |
Summary of Investment Holdings [Line Items] |  |
Measurement Alternative | 0.5 | 0.5
Equity Method | 0.0 | 0.0
Total | 0.5 | 0.5
Other |  |
Summary of Investment Holdings [Line Items] |  |
Measurement Alternative | 11.3 | 11.3
Equity Method | 26.7 | 25.7
Total | $ 38.0 | $ 37.0

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