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Reinsurance - Funds Withheld (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	$ 20,171.1		$ 20,171.1		$ 20,703.9
Funds withheld payable	19,921.8		19,921.8		20,436.1
Embedded derivative asset	3,120.1		3,120.1		3,652.8
Change in fair value of funds withheld embedded derivative	93.9	$ 3,067.3	(532.7)	$ 3,067.3
Fixed maturities, available-for-sale
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	15,909.9		15,909.9		15,693.5
Fixed maturities, trading
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	104.1		104.1		100.8
Equity securities
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	0.3		0.3		11.0
Mortgage loans
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	2,631.1		2,631.1		2,810.8
Other investments
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	241.4		241.4		179.8
Cash and cash equivalents
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	1,202.8		1,202.8		1,762.9
Accrued interest income
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	190.6		190.6		178.7
Net other assets (liabilities)
Funds Held under Reinsurance Agreements, Asset [Line Items]
Total assets - Net other liabilities	$ (109.1)		$ (109.1)		$ (33.6)

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- Definition

The amount of change in fair value of funds withheld embedded derivative.

+ References

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+ References

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- Definition

Amount of the reinsurer's funds held liability under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

+ References

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- Definition

Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(10))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1

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- Definition

Amount of funds held as security for payments to be received under reinsurance contracts.

+ References

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