Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Schedule Of Other Liabilities [Line Items]
Accounts payable	$ 149.0	$ 133.2
Deferred income	44.0	36.9
Employee benefits	34.6	36.1
Accrued litigation settlement	15.0	35.0
Accrued sales discounts and rebates	13.4	16.7
Environmental remediation and related costs	16.5	9.1
Reserve for uncertain tax positions		3.1
Other	52.9	51.3
Accounts payable and accrued liabilities	368.8	372.9
Contran | Income Taxes
Payable to affiliates:
Payable to affiliates	0.4	4.3
Contran | Trade Accounts Payables
Payable to affiliates:
Payable to affiliates	26.1	26.1
LPC | Trade Accounts Payables
Payable to affiliates:
Payable to affiliates	$ 16.9	$ 21.1