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Acquisition of European Differentiated Surfactants business - Unaudited Pro Forma Financial Information (Detail) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015
Income Statement [Abstract] |  |
Net sales | $ 1,008.0 | $ 1,269.8
Net income | $ 88.5 | $ 121.8
Earnings per share - basic | $ 3.69 | $ 5.06
Earnings per share - diluted | $ 3.62 | $ 4.95

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