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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Dec. 31, 2022
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	$ 157.5	$ 157.5	$ 68.6	$ 67.8
Financing receivables, Non-accrual assets without a valuation allowance			0.5
Financing receivables, Nonaccrual, Interest Income Accrual Reversal	0.1	(0.1)
Direct financing leases, Total amortized cost	595.9	595.9	650.1
Mortgage loans and direct financing leases, Total amortized cost	21,206.9	21,206.9	21,097.0
Direct financing leases, Recorded investment 90 days or more past due and accruing	4.0	4.0
Mortgage loans and direct financing leases, Recorded investment 90 days or more past due and accruing	16.1	16.1	8.3
Reinsurance recoverable and deposit receivable	19,737.9	19,737.9	20,614.9
30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	21.7	21.7
Mortgage loans and direct financing leases, Total amortized cost	140.1	140.1	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	75.5	75.5	21.0
90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	4.0	4.0
Mortgage loans and direct financing leases, Total amortized cost	124.1	124.1	29.6
Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	25.7	25.7	4.1
Mortgage loans and direct financing leases, Total amortized cost	339.7	339.7	105.4
Reinsurance recoverable and deposit receivable	0.0	0.0	0.0
Current
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	570.2	570.2	646.0
Mortgage loans and direct financing leases, Total amortized cost	20,867.2	20,867.2	20,991.6
Commercial mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	142.9	142.9	58.4	50.0
Financing receivables, Nonaccrual, Interest Income Accrual Reversal		(0.2)
Mortgage loans, Total amortized cost	16,855.7	16,855.7	16,581.8
Commercial mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	64.9	64.9	7.8
Commercial mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	60.9	60.9	0.8
Commercial mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	97.2	97.2	12.5
Commercial mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	223.0	223.0	21.1
Commercial mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	16,632.7	16,632.7	16,560.7
Residential mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	14.6	14.6	10.2	$ 17.8
Financing receivables, Non-accrual assets without a valuation allowance			0.5
Financing receivables, Nonaccrual, Interest Income Accrual Reversal	0.1	0.1
Mortgage loans, Total amortized cost	3,571.8	3,571.8	3,696.5
Mortgage loans, Recorded investment 90 days or more past due and accruing	10.6	10.6	7.7
Residential mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	51.5	51.5	46.0
Residential mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	13.0	13.0	15.6
Residential mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	21.2	21.2	16.4
Residential mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	85.7	85.7	78.0
Residential mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	3,486.1	3,486.1	3,618.5
Other loans
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	183.5	183.5	168.6
Mortgage loans, Recorded investment 90 days or more past due and accruing	1.5	1.5	0.6
Other loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	2.0	2.0	1.0
Other loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	1.6	1.6	0.5
Other loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	1.7	1.7	0.7
Other loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	5.3	5.3	2.2
Other loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	$ 178.2	$ 178.2	$ 166.4

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