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Derivative Financial Instruments - Credit Derivatives Sold (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Credit derivatives sold disclosures
Notional amount	$ 470.0
Fair value	17.4
Maximum future payments	$ 470.0
Weighted average expected life	15 years 10 months 24 days
Single name credit default swaps
Credit derivatives sold disclosures
Notional amount	$ 220.0	$ 220.0
Fair value	3.9	4.5
Maximum future payments	$ 220.0	$ 220.0
Weighted average expected life	1 year 8 months 12 days	2 years 8 months 12 days
Single name credit default swaps | Corporate debt securities | A
Credit derivatives sold disclosures
Notional amount	$ 40.0	$ 40.0
Fair value	0.2	0.3
Maximum future payments	$ 40.0	$ 40.0
Weighted average expected life	6 months	1 year 6 months
Single name credit default swaps | Corporate debt securities | BBB
Credit derivatives sold disclosures
Notional amount	$ 160.0	$ 140.0
Fair value	3.6	3.8
Maximum future payments	$ 160.0	$ 140.0
Weighted average expected life	2 years 1 month 6 days	3 years
Single name credit default swaps | Corporate debt securities | BB
Credit derivatives sold disclosures
Notional amount		$ 20.0
Fair value		0.2
Maximum future payments		$ 20.0
Weighted average expected life		3 years 6 months
Single name credit default swaps | Sovereign | A
Credit derivatives sold disclosures
Notional amount	$ 20.0	$ 20.0
Fair value	0.1	0.2
Maximum future payments	$ 20.0	$ 20.0
Weighted average expected life	6 months	1 year 6 months
Single name total return swaps
Credit derivatives sold disclosures
Notional amount	$ 250.0
Fair value	13.5
Maximum future payments	$ 250.0
Weighted average expected life	28 years 6 months
Single name total return swaps | Government/municipalities | AAA
Credit derivatives sold disclosures
Notional amount	$ 40.0
Fair value	2.3
Maximum future payments	$ 40.0
Weighted average expected life	30 years 7 months 6 days
Single name total return swaps | Government/municipalities | AA
Credit derivatives sold disclosures
Notional amount	$ 130.0
Fair value	6.4
Maximum future payments	$ 130.0
Weighted average expected life	26 years 6 months
Single name total return swaps | Government/municipalities | A
Credit derivatives sold disclosures
Notional amount	$ 80.0
Fair value	4.8
Maximum future payments	$ 80.0
Weighted average expected life	30 years 8 months 12 days

X

- Definition

Discloses the notional amount of the credit derivatives sold (or each group of similar credit derivatives) as of the date of the statement of financial position.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Discloses the fair value of the credit derivatives sold (or each group of similar credit derivatives) as of the date of the statement of financial position.

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Represents the weighted-average expected life in years for credit derivatives sold.

+ References

No definition available.

+ Details

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X

- Definition

Maximum potential amount of future undiscounted payments that could be required under the credit derivative, before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4K
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480434/815-10-50-4K

+ Details

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Balance Type:	credit
Period Type:	instant

X

- 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

No definition available.

+ Details

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- Details

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