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Accounts payable and accrued liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule Of Other Liabilities [Line Items]    
Accounts payable $ 186.9 $ 169.6
Employee benefits 34.3 38.5
Accrued sales discounts and rebates 11.8 14.9
Environmental remediation and related costs 6.9 7.6
Deferred income 5.7 5.4
Reserve for uncertain tax positions 3.0 3.0
Other 49.2 42.8
Total 340.2 334.6
Contran [Member] | Income Taxes [Member]
    
Schedule Of Other Liabilities [Line Items]    
Payable to affiliates   2.6
Contran [Member] | Trade Accounts Payables [Member]
    
Schedule Of Other Liabilities [Line Items]    
Payable to affiliates 26.3 26.8
LPC [Member]
    
Schedule Of Other Liabilities [Line Items]    
Payable to affiliates $ 16.1 $ 23.4