Summary of Significant Accounting Policies Revenue Recognition (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Percent of Third Party Purchases	50.00%
Amount of NGL Sales to Third Parties	$ 297.3	$ 285.4	$ 279.8
Percent of Total NGLs Sales	43.30%	38.80%	46.00%
Contributions in Aid of Construction	36.4
Deferred Revenue, Current	1.2
Deferred Revenue		$ 7.1
Chesapeake Energy Marketing Inc. [Member]
Percent of Gathering and Processing Volumes	19.60%
Apache Coporation [Member]
Percent of Gathering and Processing Volumes	17.80%
Devon Energy Production Company [Member]
Percent of Gathering and Processing Volumes	10.60%
Top 10 Producers Total Percentage [Member]
Percent of Gathering and Processing Volumes	73.00%