Subsequent Event (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2014	Jul. 01, 2014 QEP Field Services Divestitures [Member]
Subsequent Event [Line Items]
Membership Interest Sold		40.00%
Aggregate sale price of assets disposed	$ 702.3	$ 230.0
Borrowing To Fund Acquisition	$ 220.0

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