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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Revenues      
Premiums $ 6,161.1 $ 5,912.6 $ 5,663.1
Net investment income 454.4 372.6 332.1
Net realized and unrealized investment gains (losses):      
Net realized losses from sales and other (61.7) (84.2) (8.9)
Net change in fair value of equity securities and other 18.8 14.2 (5.6)
Impairments on investments:      
Credit-related impairments (2.6) (3.6) (7.7)
Losses on intent to sell securities (0.5) (2.2) (10.3)
Total impairments on investments (3.1) (5.8) (18.0)
Total net realized and unrealized investment losses (46.0) (75.8) (32.5)
Fees and other income 24.9 28.0 30.8
Total revenues 6,594.4 6,237.4 5,993.5
Losses and expenses      
Losses and loss adjustment expenses 3,729.3 3,757.4 4,134.6
Amortization of deferred acquisition costs 1,285.2 1,221.7 1,176.0
Interest expense 43.2 34.1 34.1
Other operating expenses 692.9 686.4 607.7
Total losses and expenses 5,750.6 5,699.6 5,952.4
Income from continuing operations before income taxes 843.8 537.8 41.1
Income tax expense (benefit):      
Current 169.3 131.1 32.6
Deferred 13.8 (18.6) (25.0)
Total income tax expense 183.1 112.5 7.6
Income from continuing operations 660.7 425.3 33.5
Discontinued operations (net of taxes):      
Net income $ 662.5 $ 426.0 $ 35.3
Basic:      
Income from continuing operations $ 18.46 $ 11.83 $ 0.94
Net income per share $ 18.50 $ 11.85 $ 0.99
Weighted average shares outstanding 35.8 35.9 35.7
Diluted:      
Income from continuing operations $ 18.12 $ 11.68 $ 0.93
Net income per share $ 18.16 $ 11.7 $ 0.98
Weighted average shares outstanding 36.5 36.4 36.1
Chaucer [Member]      
Discontinued operations (net of taxes):      
Income from discontinued life businesses, net of taxes $ 0.3 $ 0.7 $ 1.2
Basic:      
Income from discontinued businesses, net of taxes $ 0.01 $ 0.02 $ 0.03
Diluted:      
Income from discontinued businesses, net of taxes $ 0.01 $ 0.02 $ 0.03
Life [Member]      
Discontinued operations (net of taxes):      
Income from discontinued life businesses, net of taxes $ 1.5 $ 0.0 $ 0.6
Basic:      
Income from discontinued businesses, net of taxes $ 0.03 $ (0) $ 0.02
Diluted:      
Income from discontinued businesses, net of taxes $ 0.03 $ 0 $ 0.02