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Investments (Schedule of Other Investments) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Schedule of Investments [Line Items]    
Other investments $ 661.4 $ 709.9
Mortgage Loans on Real Estate [Member]    
Schedule of Investments [Line Items]    
Other investments 247.0 304.9
Allowance for credit losses (8.1) (5.7)
Mortgage Loans on Real Estate [Member] | South Atlantic [Member]    
Schedule of Investments [Line Items]    
Other investments 75.1 82.2
Mortgage Loans on Real Estate [Member] | Pacific [Member]    
Schedule of Investments [Line Items]    
Other investments 63.5 82.7
Mortgage Loans on Real Estate [Member] | Mid-Atlantic [Member]    
Schedule of Investments [Line Items]    
Other investments 28.7 42.6
Mortgage Loans on Real Estate [Member] | New England [Member]    
Schedule of Investments [Line Items]    
Other investments 39.7 40.6
Mortgage Loans on Real Estate [Member] | West South Central [Member]    
Schedule of Investments [Line Items]    
Other investments 22.3 22.8
Mortgage Loans on Real Estate [Member] | West North Central [Member]    
Schedule of Investments [Line Items]    
Other investments 8.9 9.1
Mortgage Loans on Real Estate [Member] | Other Locations [Member]    
Schedule of Investments [Line Items]    
Other investments 16.9 30.6
Mortgage Loans on Real Estate [Member] | Office [Member]    
Schedule of Investments [Line Items]    
Other investments 116.1 121.6
Mortgage Loans on Real Estate [Member] | Apartments [Member]    
Schedule of Investments [Line Items]    
Other investments 73.1 73.4
Mortgage Loans on Real Estate [Member] | Retail [Member]    
Schedule of Investments [Line Items]    
Other investments 8.9 32.8
Mortgage Loans on Real Estate [Member] | Hotel [Member]    
Schedule of Investments [Line Items]    
Other investments 30.7 47.0
Mortgage Loans on Real Estate [Member] | Industrial [Member]    
Schedule of Investments [Line Items]    
Other investments $ 26.3 $ 35.8