Financial Instruments - Fair Values of Derivative Instruments (Detail) - USD ($) $ in Millions |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | $ 1.2 | $ 6.8 |
| Derivative liabilities, fair value | 3.8 | 3.1 |
| Net investment hedges [Member] | Other current assets [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 0.1 | |
| Net investment hedges [Member] | Other current liabilities | ||
| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | 0.2 | |
| Foreign exchange contracts [Member] | Other current assets [Member] | ||
| Derivatives, Fair Value [Line Items] | ||
| Derivative assets, fair value | 1.2 | 6.7 |
| Foreign exchange contracts [Member] | Other current liabilities | ||
| Derivatives, Fair Value [Line Items] | ||
| Derivative liabilities, fair value | $ 3.6 | $ 3.1 |