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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	$ 86.1	$ 68.6	$ 67.8
Financing receivables, Non-accrual assets without a valuation allowance		0.5
Financing receivables, Nonaccrual, Interest Income	0.9	1.2	0.9
Direct financing leases, Total amortized cost	563.0	650.1
Mortgage loans and direct financing leases, Total amortized cost	21,397.8	21,097.0
Mortgage loans and direct financing leases, Recorded investment 90 days or more past due and accruing	10.9	8.3
Reinsurance recoverable and deposit receivable	19,493.4	20,614.9
30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	3.6
Mortgage loans and direct financing leases, Total amortized cost	130.4	54.8
60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost		4.1
Mortgage loans and direct financing leases, Total amortized cost	18.9	21.0
90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans and direct financing leases, Total amortized cost	51.4	29.6
Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	3.6	4.1
Mortgage loans and direct financing leases, Total amortized cost	200.7	105.4
Reinsurance recoverable and deposit receivable	0.0	0.0
Current
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	559.4	646.0
Mortgage loans and direct financing leases, Total amortized cost	21,197.1	20,991.6
Commercial mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	70.5	58.4	50.0
Financing receivables, Nonaccrual, Interest Income	0.8	1.2	0.9
Mortgage loans, Total amortized cost	17,072.7	16,581.8
Commercial mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	70.3	7.8
Commercial mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	2.2	0.8
Commercial mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	26.3	12.5
Commercial mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	98.8	21.1
Commercial mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	16,973.9	16,560.7
Residential mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	15.6	10.2	$ 17.8
Financing receivables, Non-accrual assets without a valuation allowance		0.5
Financing receivables, Nonaccrual, Interest Income	0.1
Mortgage loans, Total amortized cost	3,607.4	3,696.5
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	3,615.8
Mortgage loans, Recorded investment 90 days or more past due and accruing	9.5	7.7
Residential mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost		46.0
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	54.4
Residential mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost		15.6
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	14.9
Residential mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost		16.4
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	23.5
Residential mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost		78.0
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	92.8
Residential mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost		3,618.5
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	3,523.0
Other loans
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	146.3	168.6
Mortgage loans, Recorded investment 90 days or more past due and accruing	1.4	0.6
Other loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	2.1	1.0
Other loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	1.8	0.5
Other loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	1.6	0.7
Other loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	5.5	2.2
Other loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	$ 140.8	$ 166.4

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Includes net investment in lease.

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Amortized cost of financing receivable 90 days or more past due and still accruing. Includes net investment in lease.

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