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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Direct financing leases, Changes in financing receivable valuation allowance
Beginning balance, Direct financing lease valuation allowance	$ 0.9	$ 0.6	$ 0.4
Provision: Direct financing lease valuation allowance	2.4	0.3	0.2
Foreign currency translation adjustment: Direct financing lease valuation allowance	(0.3)
Ending balance, Direct financing lease valuation allowance	3.0	0.9	0.6
Total, Changes in financing receivable valuation allowance
Beginning balance valuation allowance	139.6	86.8	49.0
Provision	114.0	51.9	35.7
Charge-offs	(51.6)	(0.4)	(0.2)
Recoveries	0.9	1.4	2.3
Foreign currency translation adjustment	(0.7)	(0.1)
Ending balance valuation allowance	202.2	139.6	86.8
Allowance recorded	202.2	139.6	86.8
Commercial mortgage loans
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	128.8	77.9	43.9
Provision: Financing receivable valuation allowance	111.5	51.0	34.0
Charge-offs: Financing receivable valuation allowance	(51.4)
Foreign currency translation adjustment: Financing receivable valuation allowance	(0.3)	(0.1)
Ending balance, Financing receivable valuation allowance	$ 188.6	128.8	77.9
Total, Changes in financing receivable valuation allowance
Mortgage loans, Days delinquent to be analyzed for valuation allowance	60 days
Residential mortgage loans
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	$ 6.7	5.6	2.0
Provision: Financing receivable valuation allowance		0.1	1.5
Charge-offs: Financing receivable valuation allowance	(0.2)	(0.4)	(0.2)
Recoveries: Financing receivable valuation allowance	0.9	1.4	2.3
Foreign currency translation adjustment: Financing receivable valuation allowance	(0.1)
Ending balance, Financing receivable valuation allowance	$ 7.3	6.7	5.6
Total, Changes in financing receivable valuation allowance
Mortgage loans, Days delinquent to be analyzed for valuation allowance	60 days
Reinsurance recoverables
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	$ 3.2	2.7	2.7
Provision: Financing receivable valuation allowance	0.1	0.5
Ending balance, Financing receivable valuation allowance	3.3	3.2	2.7
Other loans
Total, Changes in financing receivable valuation allowance
Beginning balance valuation allowance	0.0	0.0
Ending balance valuation allowance	0.0	0.0	0.0
Allowance recorded	$ 0.0	$ 0.0	$ 0.0

X

- Definition

The numbers of days for which a mortgage loan has been delinquent such that it is analyzed to determine if a valuation allowance is needed.

+ References

No definition available.

+ Details

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X

- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on net investment in direct financing lease from foreign currency translation gain (loss).

+ References

No definition available.

+ Details

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No definition available.

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X

- Definition

Amount excluding accrued interest, of credit loss expense (reversal of expense) on net investment in direct financing lease.

+ References

No definition available.

+ Details

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- Definition

Amount excluding accrued interest, of allowance for credit loss on financing receivable. Includes net investment in direct financing lease.

+ References

No definition available.

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X

- Definition

Amount, excluding accrued interest, of foreign currency translation gain (loss) which decreases (increases) allowance for credit loss on financing receivable. Includes net investment in direct financing lease.

+ References

No definition available.

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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Includes net investment in direct financing lease.

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Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Includes net investment in direct financing lease.

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- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Includes net investment in direct financing lease.

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No definition available.

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- Definition

Amount excluding accrued interest, of allowance for credit loss on net investment in direct financing lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479344/326-20-45-1

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Amount, excluding accrued interest, of foreign currency translation gain (loss) which decreases (increases) allowance for credit loss on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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- Definition

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-6

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-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
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-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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