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Consolidated Statements of Comprehensive Income (unaudited) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Statement of Comprehensive Income [Abstract]    
Net income $ 274.1 $ 146.6
Other comprehensive income (loss):    
Change in unrealized losses on securities, net of taxes of $21.2 and $(18.2) for the three months ended March 31, 2026 and 2025, respectively (89.6) 75.2
Change in unrealized gains on derivative transactions, net of taxes of $0.2 and $(0.4) for the three months ended March 31, 2026 and 2025, respectively (0.9) 1.4
Change in foreign currency translation, net of taxes of $0.3 and $(2.4) for the three months ended March 31, 2026 and 2025, respectively 5.5 8.8
Change in pension and postretirement unrecognized net periodic benefit cost, net of taxes of $(0.1) and $(0.6) for the three months ended March 31, 2026 and 2025, respectively 0.2 2.2
Total other comprehensive income (loss) (84.8) 87.6
Total comprehensive income $ 189.3 $ 234.2