v3.25.2
Financial Assets and Liabilities Subject to Recurring Fair Value Measurements (Detail) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets $ 56.4 $ 207.0
Derivative liabilities 234.7 46.7
Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 2,908.5 2,772.5
Marketable equity securities, Fair Value 5.2 6.3
Total marketable securities 2,913.7 2,778.8
Derivative assets 56.4 207.0
Derivative liabilities 234.7 46.7
Fair Value, Measurements, Recurring | Level 1    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 210.3 285.7
Marketable equity securities, Fair Value 5.2 6.3
Total marketable securities 215.5 292.0
Fair Value, Measurements, Recurring | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 2,698.2 2,486.8
Total marketable securities 2,698.2 2,486.8
Derivative assets 56.4 207.0
Derivative liabilities 234.7 46.7
Fair Value, Measurements, Recurring | Cross currency swaps    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 29.5 121.3
Derivative liabilities 122.3 28.7
Fair Value, Measurements, Recurring | Cross currency swaps | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 29.5 121.3
Derivative liabilities 122.3 28.7
Fair Value, Measurements, Recurring | Interest-rate swaps    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 17.1 10.9
Derivative liabilities 9.9 12.4
Fair Value, Measurements, Recurring | Interest-rate swaps | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 17.1 10.9
Derivative liabilities 9.9 12.4
Fair Value, Measurements, Recurring | Foreign-exchange contracts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 9.6 74.8
Derivative liabilities 102.1 5.6
Fair Value, Measurements, Recurring | Foreign-exchange contracts | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 9.6 74.8
Derivative liabilities 102.1 5.6
Fair Value, Measurements, Recurring | Commodity contracts    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 0.2  
Derivative liabilities 0.4  
Fair Value, Measurements, Recurring | Commodity contracts | Level 2    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 0.2  
Derivative liabilities 0.4  
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 381.9 303.7
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 381.9 303.7
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 406.3 380.1
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 406.3 380.1
U.S. corporate securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 899.5 864.2
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 899.5 864.2
U.S. government securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 210.3 285.7
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 210.3 285.7
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 618.3 608.1
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 618.3 608.1
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 198.7 164.3
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 198.7 164.3
Other debt securities | Fair Value, Measurements, Recurring    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Marketable debt securities 193.5 166.4
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 $ 193.5 $ 166.4