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Accounts Payable and Accrued Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accounts payable and accrued liabilities    
Accounts payable $ 242.7 $ 196.3
Payable to affiliates:    
Employee benefits 35.2 45.4
Accrued sales discounts and rebates 12.2 11.8
Environmental remediation and related costs 10.5 8.6
Interest 1.5 5.0
Deferred income 1.7 3.5
Other 57.6 71.7
Total 414.5 363.7
Contran Income Taxes [Member]
    
Payable to affiliates:    
Other 7.9 0.1
Contran Trade Items [Member]
    
Payable to affiliates:    
Other 23.4 21.1
LPC [Member]
    
Payable to affiliates:    
Other 21.4  
Other [Member]
    
Payable to affiliates:    
Other $ 0.4 $ 0.2