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Discontinued Operations - Additional Information (Details) - Agricultural Solutions Business - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jan. 31, 2019
Jul. 20, 2018
Held-for-sale                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Percent of issued and outstanding common stock               100.00%
Impairment loss $ (74.0) $ (376.0) $ (160.0) $ (450.0) $ 0.0 $ 0.0    
Operating (loss) profit       $ (167.3) $ 31.8 $ 166.3    
Subsequent Event | Disposed of by Sale                
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                
Percent of issued and outstanding common stock             100.00%  
Consideration receivable             $ 4,200.0