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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status			$ 62.2	$ 67.8	$ 17.2
Financing receivables, Non-accrual assets without a valuation allowance			0.5	0.6
Financing receivables, Nonaccrual, Interest Income	$ 0.5	$ 0.8
Direct financing leases, Total amortized cost			709.5	665.0
Mortgage loans and direct financing leases, Total amortized cost			21,227.1	21,378.3
Direct financing leases, Recorded investment 90 days or more past due and accruing			49.0	1.6
Mortgage loans and direct financing leases, Recorded investment 90 days or more past due and accruing			64.7	8.0
Reinsurance recoverable and deposit receivable			20,299.2	21,156.7
30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost				6.6
Mortgage loans and direct financing leases, Total amortized cost			115.5	125.6
60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost				6.2
Mortgage loans and direct financing leases, Total amortized cost			19.2	29.1
90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost			49.0	1.6
Mortgage loans and direct financing leases, Total amortized cost			84.7	32.2
Past Due
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost			49.0	14.4
Mortgage loans and direct financing leases, Total amortized cost			219.4	186.9
Reinsurance recoverable and deposit receivable			0.0	0.0
Current
Financing receivables, non-accrual and aging disclosures
Direct financing leases, Total amortized cost			660.5	650.6
Mortgage loans and direct financing leases, Total amortized cost			21,007.7	21,191.4
Commercial mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status			50.0	50.0	13.2
Financing receivables, Nonaccrual, Interest Income	$ 0.5	$ 0.8
Mortgage loans, Total amortized cost			16,549.6	16,730.3
Mortgage loans, Recorded investment 90 days or more past due and accruing			7.5
Commercial mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			62.9	45.9
Commercial mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			2.2	7.5
Commercial mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			20.8	14.4
Commercial mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			85.9	67.8
Commercial mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			16,463.7	16,662.5
Residential mortgage loans
Financing receivables, non-accrual and aging disclosures
Financing receivables, Non-accrual status			12.2	17.8	$ 4.0
Financing receivables, Non-accrual assets without a valuation allowance			0.5	0.6
Mortgage loans, Total amortized cost			3,968.0	3,983.0
Mortgage loans, Recorded investment 90 days or more past due and accruing			8.2	6.4
Residential mortgage loans | 30 to 59 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			52.6	73.1
Residential mortgage loans | 60 to 89 Days Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			17.0	15.4
Residential mortgage loans | 90 Days or More Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			14.9	16.2
Residential mortgage loans | Past Due
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			84.5	104.7
Residential mortgage loans | Current
Financing receivables, non-accrual and aging disclosures
Mortgage loans, Total amortized cost			$ 3,883.5	$ 3,878.3

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