Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule Of Other Liabilities [Line Items]
Accounts payable	$ 121.5	$ 133.2
Deferred income	45.9	36.9
Employee benefits	39.0	36.1
Accrued litigation settlement		35.0
Accrued sales discounts and rebates	19.5	16.7
Environmental remediation and related costs	16.0	9.1
Reserve for uncertain tax positions		3.1
Other	51.8	51.3
Total	335.2	372.9
Contran | Income Taxes
Payable to affiliates:
Payable to affiliates		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	15.3	21.1
Other | Trade Accounts Payables
Payable to affiliates:
Payable to affiliates	$ 0.1