Investments - Debt Securities by Contractual Maturity (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Debt securities, AFS - Cost or amortized cost
Due in one year or less	$ 214.7	$ 202.6
Due after one year through five years	2,279.0	1,954.5
Due after five years through ten years	849.9	713.7
Due after ten years	33.8	149.1
Cost or amortized cost	5,523.9	5,118.3
Debt securities, AFS - Fair value
Due in one year or less	214.5	203.9
Due after one year through five years	2,223.2	1,974.7
Due after five years through ten years	810.1	723.6
Due after ten years	32.8	150.4
Debt securities, available for sale	5,364.8	5,168.6
Debt securities, trading - Cost or Amortized cost
Due in one year or less	3.1	4.1
Due after one year through five years	1.6	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	80.6	114.6
Debt securities, trading - Fair value
Due in one year or less	3.0	3.9
Due after one year through five years	1.6	2.3
Due after five years through ten years	0.0	0.0
Due after ten years	1.3	1.2
Debt securities, trading	55.3	90.3
Mortgage-backed and asset-backed securities
Debt securities, AFS - Cost or amortized cost
Mortgage-backed and asset-backed securities	2,146.5	2,098.4
Debt securities, AFS - Fair value
Mortgage-backed and asset-backed securities	2,084.2	2,116.0
Debt securities, trading - Cost or Amortized cost
Mortgage-backed and asset-backed securities	61.4	93.6
Debt securities, trading - Fair value
Mortgage-backed and asset-backed securities	$ 49.4	$ 82.9

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