v3.26.1
Investments - Credit Quality Indicators (Details) - Commercial Portfolio Segment
$ in Millions
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Greater than 2.0    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 7.3 $ 6.8
Financing receivable, originated year one 6.8 4.5
Financing receivable, originated year two 4.5 0.5
Financing receivable, originated year three 0.5 12.9
Financing receivable, originated year four 12.8 8.6
Prior 32.0 35.2
Total $ 63.9 $ 68.5
% of Total 0.205 0.207
1.5 to 2.0    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 6.0 $ 13.2
Financing receivable, originated year one 13.3 19.5
Financing receivable, originated year two 18.0 13.7
Financing receivable, originated year three 8.7 9.2
Financing receivable, originated year four 9.1 19.3
Prior 23.6 9.1
Total $ 78.7 $ 84.0
% of Total 0.252 0.253
1.0 to 1.5    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 7.5 $ 32.7
Financing receivable, originated year one 32.8 27.8
Financing receivable, originated year two 28.0 15.5
Financing receivable, originated year three 12.2 11.1
Financing receivable, originated year four 10.9 23.3
Prior 22.0 2.6
Total $ 113.4 $ 113.0
% of Total 0.364 0.341
Less than 1.0    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 0.0 $ 0.0
Financing receivable, originated year one 0.0 2.7
Financing receivable, originated year two 2.7 14.9
Financing receivable, originated year three 15.0 25.4
Financing receivable, originated year four 18.4 19.7
Prior 19.7 3.2
Total $ 55.8 $ 65.9
% of Total 0.179 0.199
Total    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 20.8 $ 52.7
Financing receivable, originated year one 52.9 54.5
Financing receivable, originated year two 53.2 44.6
Financing receivable, originated year three 36.4 58.6
Financing receivable, originated year four 51.2 70.9
Prior 97.3 50.1
Total $ 311.8 $ 331.4
% of Total 1.000 1.000
70% and less    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 17.8 $ 50.4
Financing receivable, originated year one 50.6 48.5
Financing receivable, originated year two 45.2 27.4
Financing receivable, originated year three 21.5 25.7
Financing receivable, originated year four 28.3 32.2
Prior 62.3 44.4
Total $ 225.7 $ 228.6
% of Total 0.724 0.690
71% to 80%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 0.0 $ 0.0
Financing receivable, originated year one 0.0 5.0
Financing receivable, originated year two 7.0 11.0
Financing receivable, originated year three 11.1 7.5
Financing receivable, originated year four 5.7 16.0
Prior 15.1 5.7
Total $ 38.9 $ 45.2
% of Total 0.125 0.136
81% to 95%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 0.0 $ 2.3
Financing receivable, originated year one 2.3 1.0
Financing receivable, originated year two 1.0 2.4
Financing receivable, originated year three 0.0 10.5
Financing receivable, originated year four 7.2 12.0
Prior 11.3 0.0
Total $ 21.8 $ 28.2
% of Total 0.070 0.085
Greater than 95%    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 3.0 $ 0.0
Financing receivable, originated year one 0.0 0.0
Financing receivable, originated year two 0.0 3.8
Financing receivable, originated year three 3.8 14.9
Financing receivable, originated year four 10.0 10.7
Prior 8.6 0.0
Total $ 25.4 $ 29.4
% of Total 0.081 0.089
Total    
Financing Receivable, Credit Quality Indicator [Line Items]    
Financing receivable, originated current year $ 20.8 $ 52.7
Financing receivable, originated year one 52.9 54.5
Financing receivable, originated year two 53.2 44.6
Financing receivable, originated year three 36.4 58.6
Financing receivable, originated year four 51.2 70.9
Prior 97.3 50.1
Total $ 311.8 $ 331.4
% of Total 1.000 1.000