Accounts and Other Receivables - Accounts and Other Receivables (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Receivables [Line Items]
Allowance for doubtful accounts	$ (1.1)	$ (1.1)
Total	336.9	285.8
Trade receivables
Receivables [Line Items]
Accounts and other receivables	276.5	229.7
Recoverable VAT and other receivables
Receivables [Line Items]
Accounts and other receivables	37.5	38.9
Receivable from affiliate | Louisiana Pigment Company, L.P.
Receivables [Line Items]
Accounts and other receivables	18.1
Refundable income taxes
Receivables [Line Items]
Accounts and other receivables	$ 5.9	$ 18.3