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