Income Taxes (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ 5,500,000	$ 7,600,000	$ (5,200,000)	$ 15,800,000
Effective tax rate	24.30%	51.00%	17.40%	80.20%
Transition Tax, tax benefit from the release of an uncertain tax position			$ 20,200,000
Tax Act, measurement period adjustment, income tax expense (benefit)	$ 3,600,000			$ 12,500,000
Transition Tax liability					$ 20,200,000
Additional measurement period adjustment	300,000
Transition Tax obligation	41,400,000		41,400,000
Income tax provision (benefit) - change in valuation allowance	(100,000)	$ 3,600,000	400,000	4,700,000
Discontinued operations | Darex
Operating Loss Carryforwards [Line Items]
Provision (benefit) for income taxes of discontinued operations	0	$ 6,100,000	$ 2,200,000	$ 14,000,000.0
Foreign tax authority - Brazil
Operating Loss Carryforwards [Line Items]
Income tax benefit, tax settlement	3,000,000.0
Legal fees and indirect taxes related to tax settlement	$ 300,000