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Accounts and other receivables (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Schedule of Accounts and Other Receivables    
Allowance for Doubtful Accounts Receivable, Current $ (1.1) $ (1.2)
Total 437.9 299.9
Trade Receivable [Member]
   
Schedule of Accounts and Other Receivables    
Accounts and other receivables 391.7 247.2
Recoverable VAT And Other Receivables [Member]
   
Schedule of Accounts and Other Receivables    
Accounts and other receivables 25.0 22.3
Refundable Income Taxes [Member]
   
Schedule of Accounts and Other Receivables    
Accounts and other receivables 2.3 2.0
Receivable from Affiliate [Member] | Louisiana Pigment Company, L.P. [Member]
   
Schedule of Accounts and Other Receivables    
Accounts and other receivables $ 20.0 $ 29.6