Background and Basis of Presentation (Details 2) (Reclassifications, USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended
Sep. 30, 2011 Operating activities	Sep. 30, 2011 Investing activities	Dec. 31, 2011 Plant turnaround assets and non-current catalysts	Dec. 31, 2011 Property, plant and equipment, net	Dec. 31, 2011 Inventories, net	Dec. 31, 2011 Other assets
Reclassifications
Prior period reclassifications	$ 0.7	$ 0.7	$ (10.5)	$ 10.5	$ (4.7)	$ 4.7

The amount of a reclassification adjustment made to prior period financial statement amounts.

No definition available.

Name:	us-gaap_PriorPeriodReclassificationAdjustment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration