Financial Assets and Liabilities Subject to Recurring Fair Value Measurements (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Dec. 31, 2015 |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | $ 115.4 | $ 137.3 |
Derivative liabilities | 55 | 48.2 |
Fair Value, Measurements, Recurring | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 1,426.3 | 1,448.1 |
Derivative assets | 115.4 | 137.3 |
Derivative liabilities | 55 | 48.2 |
Fair Value, Measurements, Recurring | Cross currency swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 91.9 | 130.5 |
Derivative liabilities | 36.9 | 37.2 |
Fair Value, Measurements, Recurring | Interest-rate swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 8.8 | 1.7 |
Derivative liabilities | 16.3 | 9.5 |
Fair Value, Measurements, Recurring | Foreign-exchange contracts | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 14.7 | 5.1 |
Derivative liabilities | 1.8 | 1.5 |
Fair Value, Measurements, Recurring | U.S. tax-exempt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 493 | 505.4 |
Fair Value, Measurements, Recurring | U.S. corporate securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 101.3 | 76.7 |
Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 16.5 | 15.7 |
Fair Value, Measurements, Recurring | Non-U.S. corporate securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 557.4 | 587 |
Fair Value, Measurements, Recurring | Non-U.S. government securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 155.9 | 193.7 |
Fair Value, Measurements, Recurring | Other debt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 102.2 | 69.6 |
Level 1 | Fair Value, Measurements, Recurring | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 15.6 | 15.1 |
Derivative assets | 0 | 0 |
Derivative liabilities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Cross currency swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 0 | 0 |
Derivative liabilities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Interest-rate swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 0 | 0 |
Derivative liabilities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Foreign-exchange contracts | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 0 | 0 |
Derivative liabilities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | U.S. tax-exempt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | U.S. corporate securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 15.6 | 15.1 |
Level 1 | Fair Value, Measurements, Recurring | Non-U.S. corporate securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Non-U.S. government securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 0 | 0 |
Level 1 | Fair Value, Measurements, Recurring | Other debt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 0 | 0 |
Level 2 | Fair Value, Measurements, Recurring | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 1,410.7 | 1,433 |
Derivative assets | 115.4 | 137.3 |
Derivative liabilities | 55 | 48.2 |
Level 2 | Fair Value, Measurements, Recurring | Cross currency swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 91.9 | 130.5 |
Derivative liabilities | 36.9 | 37.2 |
Level 2 | Fair Value, Measurements, Recurring | Interest-rate swaps | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 8.8 | 1.7 |
Derivative liabilities | 16.3 | 9.5 |
Level 2 | Fair Value, Measurements, Recurring | Foreign-exchange contracts | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Derivative assets | 14.7 | 5.1 |
Derivative liabilities | 1.8 | 1.5 |
Level 2 | Fair Value, Measurements, Recurring | U.S. tax-exempt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 493 | 505.4 |
Level 2 | Fair Value, Measurements, Recurring | U.S. corporate securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 101.3 | 76.7 |
Level 2 | Fair Value, Measurements, Recurring | U.S. government and agency securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 0.9 | 0.6 |
Level 2 | Fair Value, Measurements, Recurring | Non-U.S. corporate securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 557.4 | 587 |
Level 2 | Fair Value, Measurements, Recurring | Non-U.S. government securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | 155.9 | 193.7 |
Level 2 | Fair Value, Measurements, Recurring | Other debt securities | | |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] | | |
Marketable debt securities | $ 102.2 | $ 69.6 |