Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
QEP Energy Divestitures [Member]
Subsequent Event [Line Items]
Aggregate sale price of assets disposed	$ 807.5
Net book value of property disposed	886.0
QEP Field Services Divestitures [Member]
Subsequent Event [Line Items]
Aggregate sale price of assets disposed	$ 230.0
Membership Interest Sold	40.00%

The value of all consideration given or received by the Entity in the significant acquisition or disposal.

No definition available.

Name:	us-gaap_SignificantAcquisitionsAndDisposalsAcquisitionCostsOrSaleProceeds
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant