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Reinsurance - Funds Withheld (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	$ 19,839.5	$ 20,703.9
Funds withheld payable	19,629.5	20,436.1
Embedded derivative asset	2,567.1	3,652.8
Change in fair value of funds withheld embedded derivative	(1,085.7)	3,652.8	$ 0.0
Fixed maturities, available-for-sale
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	15,587.5	15,693.5
Fixed maturities, trading
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	316.8	100.8
Equity securities
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	0.3	11.0
Mortgage loans
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	2,385.9	2,810.8
Other investments
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	621.4	179.8
Cash and cash equivalents
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	818.4	1,762.9
Accrued interest income
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net assets	187.0	178.7
Net other assets (liabilities)
Funds Held under Reinsurance Agreements, Asset [Line Items]
Net asset (liability)	$ (77.8)	$ (33.6)

X

- Definition

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

+ References

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Amount of embedded derivative asset.

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+ References

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- Definition

Net other asset (liability) held in support of reserves associated with funds withheld agreements.

+ 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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