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Investments - Financing Receivable, Non-Accrual and Aging (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing receivables, non-accrual and aging disclosures      
Financing receivables, Non-accrual status $ 62.1 $ 59.8 $ 12.1
Financing receivables, Non-accrual assets without a valuation allowance 0.5 0.6  
Financing receivables, Nonaccrual, Interest Income 1.2 0.9 0.5
Mortgage loans, Total amortized cost 19,522.0 19,802.9  
Mortgage loans, Recorded investment 90 days or more past due and accruing 2.6 4.4  
Reinsurance recoverable and deposit receivable 24,427.9 21,445.0  
30 to 59 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 9.5 35.9  
60 to 89 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 2.3 2.4  
90 Days or More Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 17.3 20.7  
Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 29.1 59.0  
Reinsurance recoverable and deposit receivable 0.0 0.0  
Current      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 19,492.9 19,743.9  
Commercial mortgage loans      
Financing receivables, non-accrual and aging disclosures      
Financing receivables, Non-accrual status 53.9 43.8 8.7
Financing receivables, Nonaccrual, Interest Income 1.2 0.9 0.5
Mortgage loans, Total amortized cost 16,100.2 16,243.4  
Commercial mortgage loans | 90 Days or More Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 7.9 8.3  
Commercial mortgage loans | Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 7.9 8.3  
Commercial mortgage loans | Current      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 16,092.3 16,235.1  
Residential mortgage loans      
Financing receivables, non-accrual and aging disclosures      
Financing receivables, Non-accrual status 8.2 16.0 $ 3.4
Financing receivables, Non-accrual assets without a valuation allowance 0.5 0.6  
Mortgage loans, Total amortized cost 3,253.2 3,559.5  
Mortgage loans, Recorded investment 90 days or more past due and accruing 2.0 4.4  
Residential mortgage loans | 30 to 59 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 8.5 35.9  
Residential mortgage loans | 60 to 89 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 1.8 2.4  
Residential mortgage loans | 90 Days or More Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 8.7 12.4  
Residential mortgage loans | Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 19.0 50.7  
Residential mortgage loans | Current      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 3,234.2 $ 3,508.8  
Other loans      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 168.6    
Mortgage loans, Recorded investment 90 days or more past due and accruing 0.6    
Other loans | 30 to 59 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 1.0    
Other loans | 60 to 89 Days Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 0.5    
Other loans | 90 Days or More Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 0.7    
Other loans | Past Due      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost 2.2    
Other loans | Current      
Financing receivables, non-accrual and aging disclosures      
Mortgage loans, Total amortized cost $ 166.4