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Investments - Summary of Fixed Maturities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | $ 4,131.3 | $ 4,823.5
Available for sale investments in fixed income maturities, Fair Market Value | 3,788.6 | 4,881.6
Total fixed income securities — Available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due one year or less, Cost or Amortized Cost | 179.1 | 545.1
Due after one year through five years, Cost or Amortized Cost | 2,526.9 | 2,057.2
Due after five years through ten years, Cost or Amortized Cost | 815.1 | 1,090.5
Due after ten years, Cost or Amortized Cost | 13.2 | 40.7
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | 3,534.3 | 3,733.5
Due one year or less, Fair Market Value | $ 176.0 | $ 549.0
Available For Sale Securities Debt Maturities Within One Year Average Ratings By Maturity | AA+ | AA-
Due after one year through five years, Fair Market Value | $ 2,385.7 | $ 2,087.5
Available For Sale Securities Debt Maturities After One Through Five Years Average Ratings By Maturity | AA- | AA-
Due after five years through ten years, Fair Market Value | $ 707.7 | $ 1,106.3
Available For Sale Securities Debt Maturities After Five Through Ten Years Average Ratings By Maturity | A+ | A+
Due after ten years, Fair Market Value | $ 10.9 | $ 41.4
Available For Sale Securities Debt Maturities After Ten Years Average Ratings By Maturity | A- | A-
Available for sale investments in fixed income maturities, Fair Market Value | $ 3,280.3 | $ 3,784.2
Agency mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | 590.4 | 1,082.9
Available for sale investments in fixed income maturities, Fair Market Value | $ 502.7 | $ 1,090.0
Available For Sale Securities Average Ratings By Maturity | AA+ | AA+
Non-agency commercial mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | $ 6.6 | $ 6.6
Available for sale investments in fixed income maturities, Fair Market Value | $ 5.6 | $ 6.9
Available For Sale Securities Average Ratings By Maturity | AA+ | AA+
Fixed maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | $ 4,131.3 | $ 4,823.5
Available for sale investments in fixed income maturities, Fair Market Value | $ 3,788.6 | 4,881.6
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost |  | 0.5
Available for sale investments in fixed income maturities, Fair Market Value |  | $ 0.5
Available For Sale Securities Average Ratings By Maturity |  | AAA

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