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Schedule of Provision for Long-term Cash Incentive Plan (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Long-term cash incentive plan |  |  |
Opening balance | $ 8.3 |  |
Charge to statement of operations | 5.3 | $ 8.7 | $ 0.0
Closing balance | 12.6 | 8.3 |
Key Senior Managers [Member] |  |  |
Long-term cash incentive plan |  |  |
Opening balance | 8.3 |  |
Charge to statement of operations | 5.3 | 8.7 |
Translation adjustment | (1.0) | (0.4) |
Closing balance | $ 12.6 | $ 8.3 |

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