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Segment Information - Segment Financial Information (Parenthetical) (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Mar. 31, 2014
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]          
Interest cost capitalized $ 7.0 $ 3.0   $ 12.6 $ 5.3
Chemical [Member]          
Segment Reporting Information [Line Items]          
Business interruption and property insurance recoveries     $ 28.0    
Cost of Sales [Member] | Chemical [Member]          
Segment Reporting Information [Line Items]          
Business interruption loss     $ 22.9