Equity Investees (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]
Income (loss) from affiliates and joint ventures	$ 3.9	$ 5.2	$ (11.0)
Albagle Enterprise Limited [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) from sale of joint venture and affiliated entities			(7.2)
Ashapura AMCOL N.V. [Member]
Schedule of Equity Method Investments [Line Items]
Gain (loss) from sale of joint venture and affiliated entities		$ 2.1	$ (6.9)