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Assets and Liabilities Held for Sale - Schedule of Assets and Liabilities Held for Sale (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Total assets $ 42.7 $ 0.0
Total liabilities 7.8 $ 0.0
Aroma Chemicals Business [Member]    
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Trade and other accounts receivable 9.9  
Inventories 14.7  
Other current assets 1.5  
Property, plant and equipment 9.0  
Goodwill 7.6  
Total assets 42.7  
Accounts payable and accrued liabilities 5.7  
Accrued income taxes 1.6  
Plant closure provision 0.3  
Other liabilities 0.2  
Total liabilities $ 7.8