Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2011 railcars coalhopperrailcars
Loss Contingencies [Line Items]
Square Footage of Enogex Executive Offices	116,184
Lease Term for Enogex Executive Offices	5
Operating Leases, Future Minimum Payments Due	$ 9.9
Railcars under Noncancellable Operating Lease with Purchase Options	1,392
Railcars Under Short Term Lease	270
Railcars Under Short Term Lease Covered by Initial Expiration	135
Railcars Under Short Term Lease Terminated After Expiration	135
OG&E Railcar Lease Agreement [Member]
Loss Contingencies [Line Items]
Loss Contingency, Range of Possible Loss, Maximum	$ 22.8

Lease Term for Enogex Executive Offices

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- Definition

Railcars under Noncancellable Operating Lease with Purchase Options

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- Definition

Railcars Under Short Term Lease

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- Definition

Railcars Under Short Term Lease Covered by Initial Expiration

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Railcars Under Short Term Lease Terminated After Expiration

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Square Footage of Executive Offices

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The estimated maximum amount of possible loss from the contingency.

+ References

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The total of future contractually required payments on leases defined as operating.

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