v3.26.3
Changes in Accumulated Other Comprehensive Income (Loss) by Component (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance     $ 19,264.0  
Reclassified out of AOCI $ (3.3) $ 3.7 75.9 $ 169.6
Net other comprehensive income (loss) (69.2) 0.4 (74.5) 544.0
Ending balance 20,929.7 19,368.6 20,929.7 19,368.6
Derivative Contracts        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 5.6 4.9 3.4 32.5
Recorded into AOCI 10.1 (2.5) (63.9) (194.9)
Reclassified out of AOCI (4.3) 2.6 71.9 167.4
Net other comprehensive income (loss) 5.8 0.1 8.0 (27.5)
Ending balance 11.4 5.0 11.4 5.0
Marketable Debt Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (2.5) 16.7 19.2 (0.7)
Recorded into AOCI (33.1) 2.9 (55.6) 20.3
Reclassified out of AOCI   0.4 0.8 0.4
Net other comprehensive income (loss) (33.1) 3.3 (54.8) 20.7
Ending balance (35.6) 20.0 (35.6) 20.0
Pension Plans        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance 282.0 69.9 280.9 69.7
Recorded into AOCI 0.3 (1.2) (0.8) (2.1)
Reclassified out of AOCI 1.0 0.7 3.2 1.8
Net other comprehensive income (loss) 1.3 (0.5) 2.4 (0.3)
Ending balance 283.3 69.4 283.3 69.4
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (627.1) (661.2) (640.2) (1,214.8)
Recorded into AOCI (43.2) (2.5) (30.1) 551.1
Net other comprehensive income (loss) (43.2) (2.5) (30.1) 551.1
Ending balance (670.3) (663.7) (670.3) (663.7)
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning balance (342.0) (569.7) (336.7) (1,113.3)
Recorded into AOCI (65.9) (3.3) (150.4) 374.4
Reclassified out of AOCI (3.3) 3.7 75.9 169.6
Net other comprehensive income (loss) (69.2) 0.4 (74.5) 544.0
Ending balance $ (411.2) $ (569.3) $ (411.2) $ (569.3)