Quarterly Data (Unaudited) (Details Textual) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Mar. 31, 2011	Dec. 31, 2010 Antargaz [Member]
Quarterly Data Unaudited (Textual)
Increase in net income due to adjustment to foreign tax credit valuation allowance		$ 5.5
Increase in earnings per share diluted due to adjustment to foreign tax credit valuation allowance		$ 0.05
Increase in operating income due to competition law clause					9.4
Increase in earning per share diluted due to provision for competition law clause					$ 0.08
Decrease in net income due to loss on extinguishment of debt	2.2			5.2
Decrease in earning per diluted share due to loss on extinguishment of debt	$ 0.02			$ 0.05
Increase in net loss due to loss on extinguishment of debt			$ 5.2
Increase in net loss per diluted share due to loss on extinguishment of debt			$ 0.05