v3.26.1
Financial Assets and Liabilities Subject to Recurring Fair Value Measurements (Detail) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets $ 44.5 $ 63.0
Derivative liabilities 161.3 166.3
Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 3,252.8 3,203.9
Marketable equity securities, Fair Value 6.8 3.8
Total marketable securities 3,259.6 3,207.7
Derivative assets 44.5 63.0
Derivative liabilities 161.3 166.3
Fair Value, Measurements, Recurring | Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 466.7 436.2
Marketable equity securities, Fair Value 6.8 3.8
Total marketable securities 473.5 440.0
Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 2,786.1 2,767.7
Total marketable securities 2,786.1 2,767.7
Derivative assets 44.5 63.0
Derivative liabilities 161.3 166.3
Fair Value, Measurements, Recurring | Cross currency swaps    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 19.1 30.0
Derivative liabilities 112.1 67.1
Fair Value, Measurements, Recurring | Cross currency swaps | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 19.1 30.0
Derivative liabilities 112.1 67.1
Fair Value, Measurements, Recurring | Interest-rate swaps    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 7.8 20.0
Derivative liabilities 5.0 9.7
Fair Value, Measurements, Recurring | Interest-rate swaps | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 7.8 20.0
Derivative liabilities 5.0 9.7
Fair Value, Measurements, Recurring | Foreign-exchange contracts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 18.6 12.7
Derivative liabilities 41.1 89.5
Fair Value, Measurements, Recurring | Foreign-exchange contracts | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 18.6 12.7
Derivative liabilities 41.1 89.5
Fair Value, Measurements, Recurring | Commodity contracts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 1.8 0.3
Derivative liabilities 0.3  
Fair Value, Measurements, Recurring | Commodity contracts | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 1.8 0.3
Derivative liabilities 0.3  
U.S. tax-exempt securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 271.3 344.5
U.S. tax-exempt securities | Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 271.3 344.5
U.S. taxable municipal / non-U.S. provincial bonds | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 433.6 421.6
U.S. taxable municipal / non-U.S. provincial bonds | Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 433.6 421.6
U.S. corporate securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 978.2 940.3
U.S. corporate securities | Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 978.2 940.3
U.S. government securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 466.7 436.2
U.S. government securities | Fair Value, Measurements, Recurring | Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 466.7 436.2
Non-U.S. corporate securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 630.8 639.7
Non-U.S. corporate securities | Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 630.8 639.7
Non-U.S. government securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 258.0 213.8
Non-U.S. government securities | Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 258.0 213.8
Other debt securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 214.2 207.8
Other debt securities | Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities $ 214.2 $ 207.8