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Investments - Summary of Fixed Maturities (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | $ 4,823.5 | $ 4,126.7
Available for sale investments in fixed income maturities, Fair Market Value | 4,881.6 | 4,348.1
Total fixed income securities — Available for sale |  |
Debt Securities, Available-for-sale [Line Items] |  |
Due one year or less, Cost or Amortized Cost | 545.1 | 498.6
Due after one year through five years, Cost or Amortized Cost | 2,057.2 | 1,833.6
Due after five years through ten years, Cost or Amortized Cost | 1,090.5 | 741.9
Due after ten years, Cost or Amortized Cost | 40.7 | 107.6
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | 3,733.5 | 3,181.7
Due one year or less, Fair Market Value | $ 549.0 | $ 501.3
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 | $ 2,087.5 | $ 1,925.9
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 | $ 1,106.3 | $ 806.5
Available For Sale Securities Debt Maturities After Five Through Ten Years Average Ratings By Maturity | A+ | AA-
Due after ten years, Fair Market Value | $ 41.4 | $ 131.6
Available For Sale Securities Debt Maturities After Ten Years Average Ratings By Maturity | A- | AA-
Available for sale investments in fixed income maturities, Fair Market Value | $ 3,784.2 | $ 3,365.3
Agency mortgage-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | 1,082.9 | 936.0
Available for sale investments in fixed income maturities, Fair Market Value | $ 1,090.0 | $ 973.1
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 | $ 6.7
Available for sale investments in fixed income maturities, Fair Market Value | $ 6.9 | $ 7.4
Available For Sale Securities Average Ratings By Maturity | AA+ | AA+
Asset-backed |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | $ 0.5 | $ 2.3
Available for sale investments in fixed income maturities, Fair Market Value | $ 0.5 | $ 2.3
Available For Sale Securities Average Ratings By Maturity | AAA | AAA
Fixed maturities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Total, Available for sale investments in fixed income maturities, Cost or Amortized Cost | $ 4,823.5 | $ 4,126.7
Available for sale investments in fixed income maturities, Fair Market Value | $ 4,881.6 | $ 4,348.1

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