Accrued Liabilities - Accrued Liabilities (Detail) (Successor [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Successor [Member]
Unfavorable sales contracts	$ 68.6	[1]
Taxes other than income taxes	39.8	[2]	5.2	[2]
Employee-related costs and benefits	45.9		26.3
Sales rebates	11.0		8.2
Asset retirement obligations	1.9		0.9
Interest	7.5		1.3
Other	2.4		3.8
Total	$ 177.1		$ 45.7

[1] In connection with the Transaction, the Company acquired sales contracts at unfavorable market terms, which were valued at $83.0 million on the Transaction Date. See Note 2.

[2] Includes transfer taxes incurred as a result of the Transaction which were recorded in selling, general and administrative expenses on the unaudited Condensed Consolidated Statements of Operation.