Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax [Line Items]
Valuation allowance	$ 8.0	$ 6.2
Deferred tax assets, valuation allowances	20.2	16.3
Repatriation of foreign cash		93.0
Income taxes	246.9	225.0	$ 211.0
Deferred tax benefit	(2.4)	(9.8)	(3.3)
Undistributed earnings of foreign subsidiaries	142.9
Uncertain tax positions or unrecognized tax benefits	0.0	0.0	4.0	$ 5.9
Interest expense associated with uncertain tax positions	0.0	0.2	0.1
Accrued interest expense associated with uncertain tax positions	0.0	0.0
Reversal Of Income Tax Expense
Income Tax [Line Items]
Tax adjustments from settlement and lapse of applicable statutes of limitation			1.7
Reversal Of Pretax Interest Expense
Income Tax [Line Items]
Tax adjustments from settlement and lapse of applicable statutes of limitation			$ 0.1
Foreign Cash Repatriated
Income Tax [Line Items]
Income taxes		2.7
Deferred tax benefit		11.6
Natronx Technologies LLC
Income Tax [Line Items]
Deferred tax assets, valuation allowances	7.7	7.7
Quimica Geral Do Nordeste Sa
Income Tax [Line Items]
Deferred tax assets, valuation allowances	4.5	$ 2.4
Foreign Tax Authority
Income Tax [Line Items]
Loss carryforward	26.3
Loss carryforward subject to expiration	$ 1.0
Loss carryforward expiration date	Dec. 31, 2021