Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule Of Other Liabilities [Line Items]
Accounts payable	$ 165.1	$ 133.2
Payable to affiliates:
Deferred income	43.0	36.9
Employee benefits	32.5	36.1
Accrued litigation settlement	15.0	35.0
Accrued sales discounts and rebates	14.4	16.7
Environmental remediation and related costs	9.2	9.1
Reserve for uncertain tax positions	3.1	3.1
Other	49.3	51.3
Accounts payable and accrued liabilities	378.9	372.9
Contran | Income Taxes
Payable to affiliates:
Payable to affiliates	4.0	4.3
Contran | Trade Accounts Payables
Payable to affiliates:
Payable to affiliates	26.2	26.1
LPC | Trade Accounts Payables
Payable to affiliates:
Payable to affiliates	$ 17.1	$ 21.1