Commitments, Contingencies and Guarantees - Additional Information (Details) $ in Millions		12 Months Ended
	May 01, 2017 USD ($)	Dec. 31, 2017 USD ($) T	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)
Commitments And Contingencies Disclosure [Line Items]
Rent expense		$ 24.5	$ 18.8	$ 18.5
Interest expense associated with financing lease		3.9
Depreciation expense associated with financing lease		$ 2.5
Annual purchase commitment, in tons | T		240,000
Commitments		$ 230.1
Outstanding guarantees and letters of credit		5.8
Estimated minimum compensatory punitive damages		20.0
Agro Bio Sciences Inc
Commitments And Contingencies Disclosure [Line Items]
Payment to be made if certain operating performance is achieved	$ 17.8	17.8
Payment year of achieving certain operating performance	2019
Remeasurement period for liability assessed at each end of balance sheet	3 years
Maximum | Agro Bio Sciences Inc
Commitments And Contingencies Disclosure [Line Items]
Payment to be made if certain operating performance is achieved	$ 25.0
Updated Financial Performance Forecasts | Agro Bio Sciences Inc
Commitments And Contingencies Disclosure [Line Items]
Payment to be made if certain operating performance is achieved		23.2
Updated Financial Performance Forecasts | Selling, General and Administrative Expenses | Specialty Products | Agro Bio Sciences Inc
Commitments And Contingencies Disclosure [Line Items]
Increased estimate of contingent consideration liability		$ 5.4