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Classification of Net Deferred Tax Assets in Balance Sheet (Detail) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | ---
Income Tax Contingency [Line Items] |  |  |
Total current assets | $ 315.1 | $ 270.7 |
Deferred tax assets | 20.1 | 45.1 |
Total assets | $ 666.5 | 658.7 | $ 644.8
Impact of Adoption |  |  |
Income Tax Contingency [Line Items] |  |  |
Deferred tax assets (current) |  | $ (18.8) |

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