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Consolidated Statements of Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest $ 208.4 $ 91.8 $ 454.5 $ 408.6
Unrealized gains (losses) on securities:        
Unrealized gains (losses) on securities before reclassifications, not included in the statements of income 88.0 (40.4) 228.3 (141.4)
Amounts reclassified as realized investment gains from sales in the statements of income 2.6 52.6 4.0 67.9
Pretax unrealized gains (losses) on investments not included in the statements of income 90.6 12.1 232.3 (73.4)
OCI, Debt Securities, Available-for-Sale, Gain (Loss), after Adjustment, Tax 19.0 2.6 48.9 (15.3)
Net unrealized gains (losses) on securities not included in the statements of income, net of tax 71.6 9.5 183.3 (58.0)
Foreign currency translation adjustment and other 9.2 (0.7) 10.8 (6.1)
Other Comprehensive Income (Loss), Net of Tax 80.8 8.8 194.2 (64.2)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest 289.3 100.6 648.8 344.4
Other Comprehensive Income (Loss), before Tax, Portion Attributable to Noncontrolling Interest 3.9 0.0 5.0 0.0
Comprehensive Income (Loss), Net of Tax, Attributable to Parent $ 285.3 $ 100.6 $ 643.7 $ 344.4