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Financial Assets and Liabilities Subject to Recurring Fair Value Measurements (Detail) - USD ($) $ in Millions | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets | $ 58.7 | $ 207.0
Derivative liabilities | 214.8 | 46.7
Fair Value, Measurements, Recurring |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable debt securities | 2,941.1 | 2,772.5
Marketable equity securities, Fair Value | 5.4 | 6.3
Total marketable securities | 2,946.5 | 2,778.8
Derivative assets | 58.7 | 207.0
Derivative liabilities | 214.8 | 46.7
Fair Value, Measurements, Recurring | Level 1 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable debt securities | 301.2 | 285.7
Marketable equity securities, Fair Value | 5.4 | 6.3
Total marketable securities | 306.6 | 292.0
Fair Value, Measurements, Recurring | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Marketable debt securities | 2,639.9 | 2,486.8
Total marketable securities | 2,639.9 | 2,486.8
Derivative assets | 58.7 | 207.0
Derivative liabilities | 214.8 | 46.7
Fair Value, Measurements, Recurring | Cross currency swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets | 29.6 | 121.3
Derivative liabilities | 109.7 | 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 | 29.6 | 121.3
Derivative liabilities | 109.7 | 28.7
Fair Value, Measurements, Recurring | Interest-rate swaps |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets | 15.3 | 10.9
Derivative liabilities | 8.8 | 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 | 15.3 | 10.9
Derivative liabilities | 8.8 | 12.4
Fair Value, Measurements, Recurring | Foreign-exchange contracts |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative assets | 13.8 | 74.8
Derivative liabilities | 95.8 | 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 | 13.8 | 74.8
Derivative liabilities | 95.8 | 5.6
Fair Value, Measurements, Recurring | Commodity contracts |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0.5 |
Fair Value, Measurements, Recurring | Commodity contracts | Level 2 |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items] |  |
Derivative liabilities | 0.5 |
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 | 335.9 | 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 | 335.9 | 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 | 393.3 | 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 | 393.3 | 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 | 917.7 | 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 | 917.7 | 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 | 301.2 | 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 | 301.2 | 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 | 601.6 | 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 | 601.6 | 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 | 204.1 | 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 | 204.1 | 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 | 187.3 | 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 | $ 187.3 | $ 166.4

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