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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	$ 17.2	$ 21.5	$ 11.8
Financing receivables, Non-accrual assets without a valuation allowance	0.7	0.7
Financing receivables, Nonaccrual, Interest Income	0.5	0.0
Financing receivables, Total amortized cost	20,324.5	18,103.9	16,513.9
Recorded investment 90 days or more past due and accruing	5.3	7.8
Reinsurance recoverables	1,189.3	1,098.0
Current
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	20,240.1	17,951.1
Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	84.4	152.8
Reinsurance recoverables	0.0	0.0
30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	59.9	108.7
60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	11.5	21.2
90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	13.0	22.9
Commercial mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	13.2	10.7	5.0
Financing receivables, Total amortized cost	16,394.7	15,441.6	15,017.2
Recorded investment 90 days or more past due and accruing	2.7	1.3
Commercial mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	16,386.9	15,378.3
Commercial mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	7.8	63.3
Commercial mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	0.7	42.1
Commercial mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost		9.2
Commercial mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	7.1	12.0
Direct financing leases
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	609.9	710.8
Recorded investment 90 days or more past due and accruing	0.7
Direct financing leases | Current
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	607.3	707.6
Direct financing leases | Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	2.6	3.2
Direct financing leases | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	1.9	3.2
Direct financing leases | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	0.7
Residential mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	4.0	10.8	6.8
Financing receivables, Non-accrual assets without a valuation allowance	0.7	0.7
Financing receivables, Total amortized cost	3,319.9	1,951.5	$ 1,496.7
Recorded investment 90 days or more past due and accruing	1.9	6.5
Residential mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	3,245.9	1,865.2
Residential mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	74.0	86.3
Residential mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	59.2	66.6
Residential mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	9.6	8.8
Residential mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Financing receivables, Total amortized cost	$ 5.2	$ 10.9

X

- Definition

Amount excluding accrued interest, before allowance for credit loss, of financing receivable.

+ References

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Amount of interest income on financing receivable on nonaccrual status.

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Amount of financing receivable on nonaccrual status with no allowance for credit loss.

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Amount before valuation allowance recoverable under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves.

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