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Investments - Mortgage Loan Valuation Allowance (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Direct financing leases, Changes in financing receivable valuation allowance
Beginning balance, Direct financing lease valuation allowance	$ 0.6	$ 0.4	$ 0.6	$ 0.4
Provision: Direct financing lease valuation allowance	0.6	(0.1)	0.5	(0.1)
Foreign currency translation adjustment: Direct financing lease valuation allowance	(0.1)
Ending balance, Direct financing lease valuation allowance	1.1	0.3	1.1	0.3
Total, Changes in financing receivable valuation allowance
Beginning balance valuation allowance	90.9	71.0	86.8	49.0
Provision	20.9	(3.5)	24.5	18.1
Charge-offs			(0.1)	(0.1)
Recoveries	0.5	1.0	0.7	1.4
Foreign currency translation adjustment	(0.2)	(0.3)	0.2	(0.2)
Ending balance valuation allowance	112.1	68.2	112.1	68.2
Commercial mortgage loans
Mortgage loans and reinsurance recoverables, Changes in financing receivable valuation allowance
Beginning balance, Financing receivable valuation allowance	81.9	66.1	77.9	43.9
Provision: Financing receivable valuation allowance	19.7	(2.2)	23.5	19.9
Foreign currency translation adjustment: Financing receivable valuation allowance	(0.1)	(0.3)	0.1	(0.2)
Ending balance, Financing receivable valuation allowance	101.5	63.6	$ 101.5	63.6
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	5.9	1.8	$ 5.6	2.0
Provision: Financing receivable valuation allowance	0.4	(1.1)	0.5	(1.6)
Charge-offs: Financing receivable valuation allowance			(0.1)	(0.1)
Recoveries: Financing receivable valuation allowance	0.5	1.0	0.7	1.4
Foreign currency translation adjustment: Financing receivable valuation allowance			0.1
Ending balance, Financing receivable valuation allowance	6.8	1.7	$ 6.8	1.7
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	2.5	2.7	$ 2.7	2.7
Provision: Financing receivable valuation allowance	0.2	(0.1)		(0.1)
Ending balance, Financing receivable valuation allowance	$ 2.7	$ 2.6	$ 2.7	$ 2.6

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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- Definition

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

+ References

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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X

- Definition

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

+ References

No definition available.

+ Details

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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.

+ Details

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X

- Definition

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

+ References

No definition available.

+ Details

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- Definition

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

+ References

No definition available.

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X

- Definition

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

+ References

No definition available.

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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.

+ References

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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- Definition

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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X

- 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

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+ References

No definition available.

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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

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479319/326-20-50-13

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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
-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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