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QEP Midstream (Reconciliation of Proceeds from Subsidiary Initial Public Offering) (Details) (USD $)
In Millions, unless otherwise specified
0 Months Ended 6 Months Ended
Aug. 14, 2013
Jun. 30, 2014
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) (1.1)
Repayment of outstanding debt with QEP (95.5)  
Net proceeds distributed to QEP from the IPO $ 351.1