Fair Value Measurements (Textual) (Details) (USD $) In Millions, except Share data, unless otherwise specified			9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 CO2 Solutions [Member]
Subsidiary or Equity Method Investee [Line Items]
Cash	$ 5.8	$ 7.2
Number of common shares fair value (shares)			10,000,000