Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax [Line Items]
Valuation allowance	$ 8.7	$ 11.4
Deferred tax assets, valuation allowances	22.6	23.2
Reserve for uncertain tax position relating to worthless stock deduction for investment	(10.6)	12.0	$ 0.0
Decrease in unrecognized tax benefits is reasonably possible	0.7	12.0
Effective Income tax rate reconciliation, tax settlement, amount		1.4
Income tax benefits recognized from deductions		10.6
Uncertain tax positions that would affect the effective tax rate	6.2	18.0	3.9
Uncertain tax positions that would result in adjustments to deferred taxes	1.1	0.9	0.8
Interest expense associated with uncertain tax positions	0.4	0.4	0.2
Unrecognized tax benefits, accrued interest expense	1.0	0.6	$ 0.3
Brazil
Income Tax [Line Items]
Reserve for uncertain tax position relating to worthless stock deduction for investment		12.0
Quimica Geral Do Nordeste Sa
Income Tax [Line Items]
Deferred tax assets, valuation allowances	1.3	1.3
Foreign Tax Authority
Income Tax [Line Items]
Loss carryforward	27.2
Loss carryforward subject to expiration	$ 0.3
Loss carryforward expiration date	Dec. 31, 2024
Foreign Tax Authority | Unrealized Foreign Tax Credit Carryforwards
Income Tax [Line Items]
Deferred tax assets, valuation allowances	$ 12.6	$ 10.5