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Accumulated Other Comprehensive Income - Components of Accumulated Other Comprehensive Income, Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
AOCI:    
Beginning balance $ 5,871.6 $ 5,106.7
Change in accumulated other comprehensive income (loss) before reclassifications (97.1) 72.3
Amounts reclassified from accumulated other comprehensive income (loss) 12.3 15.3
Total other comprehensive income (loss) (84.8) 87.6
Ending balance 5,869.4 5,234.2
Accumulated Other Comprehensive Loss    
AOCI:    
Beginning balance (544.2) (836.1)
Ending balance (629.0) (748.5)
Foreign currency translation adjustment    
AOCI:    
Beginning balance (351.5) (415.2)
Change in accumulated other comprehensive income (loss) before reclassifications 5.5 8.8
Amounts reclassified from accumulated other comprehensive income (loss) 0.0 0.0
Total other comprehensive income (loss) 5.5 8.8
Ending balance (346.0) (406.4)
Net unrealized gains (losses) on investments    
AOCI:    
Beginning balance (63.0) (291.9)
Change in accumulated other comprehensive income (loss) before reclassifications (101.7) 61.8
Amounts reclassified from accumulated other comprehensive income (loss) 12.1 13.4
Total other comprehensive income (loss) (89.6) 75.2
Ending balance (152.6) (216.7)
Net unrealized gains on derivative transactions    
AOCI:    
Beginning balance 1.8 2.2
Change in accumulated other comprehensive income (loss) before reclassifications (0.5) 1.7
Amounts reclassified from accumulated other comprehensive income (loss) (0.4) (0.3)
Total other comprehensive income (loss) (0.9) 1.4
Ending balance 0.9 3.6
Unamortized net losses on Pension Plans    
AOCI:    
Beginning balance (131.5) (131.2)
Change in accumulated other comprehensive income (loss) before reclassifications (0.4) 0.0
Amounts reclassified from accumulated other comprehensive income (loss) 0.6 2.2
Total other comprehensive income (loss) 0.2 2.2
Ending balance $ (131.3) $ (129.0)