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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2023
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	$ 77.4		$ 86.1	$ 68.6
Financing receivables, Non-accrual assets without a valuation allowance	8.2
Financing receivables, Nonaccrual, Interest Income	0.1
Financing receivables, Nonaccrual, Interest Income Accrual Reversal		$ (0.2)
Direct financing leases, Total amortized cost	587.9		563.0
Mortgage loans and direct financing leases, Total amortized cost	21,178.1		21,397.8
Mortgage loans and direct financing leases, Recorded investment 90 days or more past due and accruing	11.0		10.9
Reinsurance recoverable and deposit receivable	19,395.8		19,493.4
30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	3.5		3.6
Mortgage loans and direct financing leases, Total amortized cost	73.5		130.4
60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans and direct financing leases, Total amortized cost	29.9		18.9
90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans and direct financing leases, Total amortized cost	50.7		51.4
Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	3.5		3.6
Mortgage loans and direct financing leases, Total amortized cost	154.1		200.7
Reinsurance recoverable and deposit receivable	0.0		0.0
Current
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost	584.4		559.4
Mortgage loans and direct financing leases, Total amortized cost	21,024.0		21,197.1
Commercial mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	60.7		70.5	58.4
Financing receivables, Nonaccrual, Interest Income Accrual Reversal		$ (0.2)
Mortgage loans, Total amortized cost	16,659.4		17,072.7
Commercial mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	6.5		70.3
Commercial mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	9.1		2.2
Commercial mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	26.6		26.3
Commercial mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	42.2		98.8
Commercial mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	16,617.2		16,973.9
Residential mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	16.6		15.6	$ 10.2
Financing receivables, Non-accrual assets without a valuation allowance	8.1
Financing receivables, Nonaccrual, Interest Income	0.1
Mortgage loans, Total amortized cost	3,796.5		3,607.4
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	3,799.6		3,615.8
Mortgage loans, Recorded investment 90 days or more past due and accruing, Excludes unallocated basis adjustments	10.0		9.5
Residential mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	61.8		54.4
Residential mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	19.2		14.9
Residential mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	22.5		23.5
Residential mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	103.5		92.8
Residential mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost, Excludes unallocated basis adjustments	3,696.1		3,523.0
Other loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status	0.1
Financing receivables, Non-accrual assets without a valuation allowance	0.1
Mortgage loans, Total amortized cost	131.2		146.3
Mortgage loans, Recorded investment 90 days or more past due and accruing	1.0		1.4
Other loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	1.7		2.1
Other loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	1.6		1.8
Other loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	1.6		1.6
Other loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	4.9		5.5
Other loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost	$ 126.3		$ 140.8

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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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