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Other Comprehensive Income (Loss) (Reclassifications out of Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized losses from sales and other $ (23.5) $ (0.9) $ (55.2) $ (1.9)
Income (loss) from continuing operations before income taxes 129.7 (0.9) 326.3 (109.1)
Loss adjustment expenses and other operating expenses (954.0) (1,061.5) (2,896.8) (3,218.8)
Income tax (expense) benefit (27.6) 9.1 (68.3) 35.3
Income (loss) from continuing operations 102.1 8.2 258.0 (73.8)
Net income (loss) 102.1 8.6 258.1 (72.6)
Life [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income (loss) from discontinued businesses, net of taxes     0.1  
Reclassification out of Accumulated Other Comprehensive Loss [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income (loss) (20.3) (1.8) (48.4) (13.7)
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Defined Benefit Pension and Postretirement Plans [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Loss adjustment expenses and other operating expenses (1.7) (1.9) (5.1) (5.9)
Income tax (expense) benefit 0.3 0.4 1.0 1.2
Income (loss) from continuing operations (1.4) (1.5) (4.1) (4.7)
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Net Unrealized Appreciation (Depreciation) on Investments [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net realized losses from sales and other (24.7) (0.9) (56.6) (1.9)
Impairments on investments (0.2) 0.0 (1.5) (11.1)
Income (loss) from continuing operations before income taxes (24.9) (0.9) (58.1) (13.0)
Income tax (expense) benefit 5.9 0.6 13.5 4.0
Income (loss) from continuing operations (19.0) (0.3) (44.6) (9.0)
Net income (loss) (19.1) (0.3) (44.9) (9.0)
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Net Unrealized Appreciation (Depreciation) on Investments [Member] | Life [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income (loss) from discontinued businesses, net of taxes (0.1) 0.0 (0.3) 0.0
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Net change in market risk        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax (expense) benefit (0.1) 0.0 (0.2) 0.0
Income (loss) from discontinued businesses, net of taxes 0.2 0.0 0.6 0.0
Reclassification out of Accumulated Other Comprehensive Loss [Member] | Net change in market risk | Life [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income (loss) from discontinued businesses, net of taxes $ 0.3 $ 0.0 $ 0.8 $ 0.0