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QEP Midstream (Reconciliation of Proceeds from Subsidiary Initial Public Offering) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended
Aug. 14, 2013
Reconciliation of Proceeds from Subsidiary IPO [Line Items]  
Total proceeds from the Subsidiary IPO $ 483.0
Offering costs (33.4)
Net proceeds from Subsidiary IPO 449.6
Revolving credit facility origination fees (3.0)
Repayment of outstanding debt with QEP (95.5)
Net proceeds distributed to QEP from the IPO $ 351.1