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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Financing receivables, non-accrual and aging disclosures      
Financing receivables, Non-accrual status $ 59.8 $ 12.1 $ 9.1
Financing receivables, Non-accrual assets without a valuation allowance 0.6 0.7  
Financing receivables, Nonaccrual, Interest Income 0.9 0.5  
Mortgage loans, Total amortized cost 19,802.9 18,952.0  
Reinsurance recoverable and deposit receivable 22,032.0 1,189.0  
Current      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 19,743.9 18,917.0  
Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 59.0 35.0  
Reinsurance recoverable and deposit receivable 0.0 0.0  
30 to 59 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 35.9 27.6  
60 to 89 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 2.4 2.9  
90 Days or More Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 20.7 4.5  
Commercial mortgage loans      
Financing receivables, non-accrual and aging disclosures      
Financing receivables, Non-accrual status 43.8 8.7  
Financing receivables, Nonaccrual, Interest Income 0.9 0.5  
Mortgage loans, Total amortized cost 16,243.4 16,007.7  
Commercial mortgage loans | Current      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 16,235.1 16,007.7  
Commercial mortgage loans | Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 8.3    
Commercial mortgage loans | 90 Days or More Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 8.3    
Residential mortgage loans      
Financing receivables, non-accrual and aging disclosures      
Financing receivables, Non-accrual status 16.0 3.4 $ 9.1
Financing receivables, Non-accrual assets without a valuation allowance 0.6 0.7  
Mortgage loans, Total amortized cost 3,559.5 2,944.3  
Residential mortgage loans | Current      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 3,508.8 2,909.3  
Residential mortgage loans | Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 50.7 35.0  
Residential mortgage loans | 30 to 59 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 35.9 27.6  
Residential mortgage loans | 60 to 89 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 2.4 2.9  
Residential mortgage loans | 90 Days or More Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost $ 12.4 $ 4.5