v3.25.1
Investments - Schedule of Loans by Ratio (Details)
$ in Millions
Mar. 31, 2025
USD ($)
loan
Dec. 31, 2024
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 836.1 $ 787.4
Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 218.3 $ 210.1
Loan Count | loan 23 17
Mortgage Loans | Excluding Residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 203.2 $ 197.6
Loan Count | loan 19 16
Equal to or less than 50.0% | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost   $ 1.7
Loan Count | loan   2
Greater than 50.0% to 55.0% | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 22.6 $ 43.2
Loan Count | loan 2 1
Greater than 55.0% to 60.0% | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 15.1 $ 12.4
Loan Count | loan 5 1
Greater than 60.0% to 70.0% | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 102.1 $ 47.6
Loan Count | loan 8 4
Greater than 70.0% | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 78.5 $ 105.2
Loan Count | loan 8 9
Less than 1.00 | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 37.4 $ 12.2
Loan Count | loan 4 3
1.00 to 1.50 | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 65.0 $ 37.1
Loan Count | loan 8 4
Greater than 1.5 to 2.0 | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 88.2 $ 135.7
Loan Count | loan 6 8
Greater than 2.0 to 3.0 | Mortgage Loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Commercial mortgage loans, cost $ 12.6 $ 12.6
Loan Count | loan 1 1