Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax [Line Items]
Valuation allowance	$ 6.2	$ 8.0
Deferred tax assets, valuation allowances	16.3	12.0
Repatriation of foreign cash	93.0
Income taxes	225.0	211.0	$ 203.4
Deferred tax benefit	(9.8)	(3.3)	3.6
Undistributed earnings of foreign subsidiaries	135.7
Uncertain tax positions or unrecognized tax benefits	0.0	4.0	5.9	$ 9.1
Interest expense associated with uncertain tax positions	0.2	0.1	$ 0.1
Accrued interest expense associated with uncertain tax positions	0.0	0.2
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
Quimica Geral Do Nordeste Sa
Income Tax [Line Items]
Deferred tax assets, valuation allowances	2.4	$ 4.0
Foreign Tax Authority
Income Tax [Line Items]
Loss carryforward	20.4
Loss carryforward subject to expiration	$ 1.0
Loss carryforward expiration date	Dec. 31, 2018