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Derivative Financial Instruments - Fair Value of Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Derivatives, fair value disclosures
Derivative instruments, assets	$ 1,037.9	$ 648.2
Derivative instruments, liabilities	(807.2)	(1,929.9)
Fair value of embedded derivative liabilities reported with contractholder funds	1,228.8	578.4
Fair value of net (asset) liability embedded derivative reported with funds withheld payable	(2,559.2)	(3,014.5)
Derivatives designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, assets	131.0	170.4
Derivative instruments, liabilities	196.6	103.7
Derivatives not designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, assets	906.9	477.8
Derivative instruments, liabilities	(1,003.8)	(2,033.6)
Interest rate contracts | Derivatives designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, liabilities	66.3	83.0
Interest rate contracts | Derivatives not designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, assets	22.8	35.4
Derivative instruments, liabilities	136.2	246.9
Foreign exchange contracts | Derivatives designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, assets	131.0	170.4
Derivative instruments, liabilities	130.3	20.7
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, assets	28.2	20.0
Derivative instruments, liabilities	21.1	34.8
Equity contracts | Derivatives not designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, assets	845.8	405.0
Derivative instruments, liabilities	160.2	119.8
Credit contracts | Derivatives not designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, assets	10.1	17.4
Derivative instruments, liabilities	9.1	1.0
Other contracts | Derivatives not designated as hedging instruments
Derivatives, fair value disclosures
Derivative instruments, liabilities	$ (1,330.4)	$ (2,436.1)

X

- Definition

This item represents the fair value of embedded derivatives that have been bifurcated from an investment host contract or universal life contract.

+ References

No definition available.

+ Details

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- Definition

Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and elected not to be offset, and funds withheld embedded derivative (asset) liability.

+ References

No definition available.

+ Details

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- Definition

Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and elected not to be offset.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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