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v3.23.4

Investments - Summary of Fixed Maturities (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available for sale amortized cost | $ 4,231.2 | $ 4,131.3 | $ 4,823.5
Fair market value | 3,908.2 | 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 | 242.4 | 179.1 | 545.1
Due after one year through five years, Cost or Amortized Cost | 2,736.2 | 2,526.9 | 2,057.2
Due after five years through ten years, Cost or Amortized Cost | 684.9 | 815.1 | 1,090.5
Due after ten years, Cost or Amortized Cost | 1.8 | 13.2 | 40.7
Fixed income securities, available for sale amortized cost | 3,665.3 | 3,534.3 | 3,733.5
Due one year or less, Fair Market Value | $ 236.5 | $ 176.0 | $ 549.0
Available For Sale Securities Debt Maturities Within One Year Average Ratings By Maturity | AA | AA+ | AA-
Due after one year through five years, Fair Market Value | $ 2,594.7 | $ 2,385.7 | $ 2,087.5
Available For Sale Securities Debt Maturities After One Through Five Years Average Ratings By Maturity | AA- | AA- | AA-
Due after five years through ten years, Fair Market Value | $ 595.2 | $ 707.7 | $ 1,106.3
Available For Sale Securities Debt Maturities After Five Through Ten Years Average Ratings By Maturity | A+ | A+ | A+
Due after ten years, Fair Market Value | $ 1.1 | $ 10.9 | $ 41.4
Available For Sale Securities Debt Maturities After Ten Years Average Ratings By Maturity | BB | A- | A-
Fair market value | $ 3,427.5 | $ 3,280.3 | $ 3,784.2
Agency mortgage-backed |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available for sale amortized cost | 559.3 | 590.4 | 1,082.9
Fair market value | $ 475.0 | $ 502.7 | $ 1,090.0
Available For Sale Securities Average Ratings By Maturity | AA+ | AA+ | AA+
Non-agency commercial mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available for sale amortized cost | $ 6.6 | $ 6.6 | $ 6.6
Fair market value | $ 5.7 | $ 5.6 | $ 6.9
Available For Sale Securities Average Ratings By Maturity | AA+ | AA+ | AA+
Fixed maturities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available for sale amortized cost | $ 4,231.2 | $ 4,131.3 | $ 4,823.5
Fair market value | $ 3,908.2 | $ 3,788.6 | 4,881.6
Asset-backed |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fixed income securities, available for sale amortized cost |  |  | 0.5
Fair market value |  |  | $ 0.5
Available For Sale Securities Average Ratings By Maturity |  |  | AAA

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