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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Mar. 31, 2025	Mar. 31, 2024
Direct financing leases, Changes in financing receivable valuation allowance
Beginning balance, Direct financing lease valuation allowance	$ 3.1	$ 1.9	$ 3.0	$ 0.9
Provision: Direct financing lease valuation allowance	4.5	1.3	4.4	2.4
Foreign currency translation adjustment: Direct financing lease valuation allowance	(0.1)	0.2	0.1	0.1
Ending balance, Direct financing lease valuation allowance	7.5	3.4	7.5	3.4
Total, Changes in financing receivable valuation allowance
Beginning balance valuation allowance	216.9	179.4	202.2	139.6
Provision	17.3	52.3	27.7	104.0
Charge-offs	(0.2)	(38.2)	(1.6)	(50.1)
Recoveries	0.1	0.3	5.3	0.7
Foreign currency translation adjustment	(0.3)	0.4	0.2
Ending balance valuation allowance	233.8	194.2	233.8	194.2
Allowance recorded	233.8	194.2	233.8	194.2
Accrued interest receivable written off			0.3
Commercial mortgage loans
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	196.1	165.0	188.6	128.8
Provision: Financing receivable valuation allowance	8.5	52.1	16.7	100.3
Charge-offs: Financing receivable valuation allowance		(38.1)	(1.3)	(49.9)
Recoveries: Financing receivable valuation allowance	0.1		0.5
Foreign currency translation adjustment: Financing receivable valuation allowance	(0.1)	0.1	0.1	(0.1)
Ending balance, Financing receivable valuation allowance	204.6	179.1	$ 204.6	179.1
Total, Changes in financing receivable valuation allowance
Mortgage loans, Days delinquent to be analyzed for valuation allowance			60 days
Accrued interest receivable written off			$ 0.3
Residential mortgage loans
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	14.5	9.4	7.3	6.7
Provision: Financing receivable valuation allowance	4.2	(1.1)	6.6	1.4
Charge-offs: Financing receivable valuation allowance	(0.2)	(0.1)	(0.3)	(0.2)
Recoveries: Financing receivable valuation allowance		0.3	4.8	0.7
Foreign currency translation adjustment: Financing receivable valuation allowance	(0.1)	0.1
Ending balance, Financing receivable valuation allowance	18.4	8.6	$ 18.4	8.6
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	3.1	$ 3.3	3.2
Provision: Financing receivable valuation allowance	0.1			(0.1)
Ending balance, Financing receivable valuation allowance	3.3	3.1	$ 3.3	$ 3.1
Other loans
Total, Changes in financing receivable valuation allowance
Beginning balance valuation allowance	$ 0.0	$ 0.0
Allowance recorded					$ 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.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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- Definition

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

+ References

No definition available.

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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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- 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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- Definition

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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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

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-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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- Definition

Amount of writeoff of accrued interest on financing receivable recognized by reversing interest income.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3D
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-3D

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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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- Definition

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
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-SubTopic 20
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-Section 50
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-Publisher FASB
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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 13
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-Publisher FASB
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- Definition

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
-Topic 326
-SubTopic 20
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-13

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