Investments - Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Jun. 30, 2026	Dec. 31, 2025
Debt securities, AFS - Cost or amortized cost
Due in one year or less	$ 262.4	$ 202.6
Due after on year through five years	2,192.4	1,954.5
Due after five years through ten years	625.3	713.7
Due after ten years	30.0	149.1
Cost or amortized cost	5,180.5	5,118.3
Debt securities, AFS - Fair value
Due in one year or less	261.8	203.9
Due after one year through five years	2,186.2	1,974.7
Due after five years through ten years	619.5	723.6
Due after ten years	30.3	150.4
Debt securities, available for sale	5,156.9	5,168.6
Debt securities, trading - Cost or Amortized cost
Due in one year or less	3.2	4.1
Due after one year through five years	2.1	2.4
Due after five years through ten years	0.0	0.0
Due after ten years	14.5	14.5
Cost or amortized cost	88.6	114.6
Debt securities, trading - Fair value
Due in one year or less	3.1	3.9
Due after one year through five years	2.0	2.3
Due after five years through ten years	0.0	0.0
Due after ten years	1.2	1.2
Debt securities, trading	64.8	90.3
Mortgage-backed and asset-backed securities
Debt securities, AFS - Cost or amortized cost
Mortgage-backed and asset-backed securities	2,070.4	2,098.4
Debt securities, AFS - Fair value
Mortgage-backed and asset-backed securities	2,059.1	2,116.0
Debt securities, trading - Cost or Amortized cost
Debt securities without single maturity date	68.8	93.6
Debt securities, trading - Fair value
Debt securities without single maturity date	$ 58.5	$ 82.9

Debt Securities, Trading, Amortized Cost, Rolling Maturity

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