Equity Method Investments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		1 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2011	Jan. 31, 2012 Blue Flint	Sep. 30, 2012 Blue Flint	Sep. 30, 2012 Evonik Industries AG
Equity Method Investee
Proceeds from sale of interest in equity method investee			$ 18.5
Equity earnings in Blue Flint since investment			15.0
Non-cash gain (loss) related to sale of interest in equity method investee	$ (3.2)	$ (6.3)		$ (6.3)	$ (3.2)