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Investments - Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Debt securities, AFS - Cost or amortized cost |  |
Due in one year or less | $ 450.6 | $ 449.3
Due after one year through five years | 1,411.9 | 1,648.0
Due after five years through ten years | 533.0 | 589.5
Due after ten years | 117.7 | 104.3
Cost or amortized cost | 4,617.0 | 5,143.8
Debt securities, AFS - Fair value |  |
Due in one year or less | 449.5 | 448.2
Due after one year through five years | 1,419.7 | 1,646.7
Due after five years through ten years | 538.3 | 586.2
Due after ten years | 115.0 | 101.9
Debt securities, available for sale | 4,635.2 | 5,131.0
Debt securities, trading - Cost or Amortized cost |  |
Due in one year or less | 0.7 | 0.5
Due after one year through five years | 6.3 | 6.7
Due after five years through ten years | 0.2 | 0.3
Due after ten years | 12.6 | 11.9
Cost or amortized cost | 140.9 | 187.3
Debt securities, trading - Fair value |  |
Due in one year or less | 0.7 | 0.5
Due after one year through five years | 6.0 | 6.3
Due after five years through ten years | 0.2 | 0.3
Due after ten years | 1.1 | 1.6
Debt securities, trading | 117.6 | 162.2
Mortgage-backed and asset-backed securities |  |
Debt securities, AFS - Cost or amortized cost |  |
Without single maturity date | 2,103.8 | 2,352.7
Debt securities, AFS - Fair value |  |
Without single maturity date | 2,112.7 | 2,348.0
Debt securities, trading - Cost or Amortized cost |  |
Without single maturity date | 121.1 | 167.9
Debt securities, trading - Fair value |  |
Without single maturity date | $ 109.6 | $ 153.5

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