Schedule of Commodity Derivative Contracts (Details) (USD $) In Millions, unless otherwise specified			9 Months Ended																9 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 QEP Marketing [Member] 2014 [Member] Swap [Member] IFNPCR [Member] Purchased Gas and Oil Expense [Member] Btu	Sep. 30, 2014 QEP Energy [Member] 2014 [Member] Swap [Member] NYMEX WTI less ICE Brent Differential [Member] Oil Sales [Member] bbl	Sep. 30, 2014 QEP Energy [Member] 2014 [Member] Swap [Member] NYMEX WTI less LLS Differential [Member] Oil Sales [Member] bbl	Sep. 30, 2014 QEP Energy [Member] 2015 [Member] Swap [Member] NYMEX WTI less LLS Differential [Member] Oil Sales [Member] bbl	Sep. 30, 2014 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Dec. 31, 2013 Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member]	Sep. 30, 2014 Long-term [Member] Interest Rate Swap [Member]	Dec. 31, 2013 Long-term [Member] Interest Rate Swap [Member]	Dec. 31, 2013 Long-term [Member] Commodity Contract [Member]	Sep. 30, 2014 Long-term [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Commodity Contract [Member]	Dec. 31, 2013 Short-term [Member] Interest Rate Swap [Member]	Dec. 31, 2013 Short-term [Member] Commodity Contract [Member]	Sep. 30, 2014 Short-term [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Interest Rate Swap [Member]	Dec. 31, 2013 Short-term [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Interest Rate Swap [Member]	Sep. 30, 2014 Short-term [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Commodity Contract [Member]	Dec. 31, 2013 Short-term [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Inputs, Level 2 [Member] Commodity Contract [Member]	Sep. 30, 2014 Oil Sales [Member] QEP Energy [Member] 2014 [Member] Swap [Member] NYMEX WTI [Member] bbl	Sep. 30, 2014 Oil Sales [Member] QEP Energy [Member] 2015 [Member] Swap [Member] NYMEX WTI [Member] bbl	Sep. 30, 2014 Oil Sales [Member] QEP Energy [Member] 2015 [Member] Swap [Member] BRENT ICE [Member] bbl	Sep. 30, 2014 Oil Sales [Member] QEP Energy [Member] Year2016 [Member] Swap [Member] NYMEX WTI [Member] bbl	Sep. 30, 2014 Natural Gas Sales [Member] QEP Marketing [Member] 2014 [Member] Swap [Member] IFNPCR [Member] Btu	Sep. 30, 2014 Natural Gas Sales [Member] QEP Marketing [Member] 2015 [Member] Swap [Member] IFNPCR [Member] Btu	Sep. 30, 2014 Natural Gas Sales [Member] QEP Energy [Member] 2014 [Member] Swap [Member] NYMEX [Member] MMBTU	Sep. 30, 2014 Natural Gas Sales [Member] QEP Energy [Member] 2014 [Member] Swap [Member] IFNPCR [Member] MMBTU	Sep. 30, 2014 Natural Gas Sales [Member] QEP Energy [Member] 2015 [Member] Swap [Member] NYMEX [Member] MMBTU	Sep. 30, 2014 Natural Gas Sales [Member] QEP Energy [Member] 2015 [Member] Swap [Member] IFNPCR [Member] MMBTU
Derivatives, Fair Value [Line Items]
Year			2014	2014	2014	2015													2014	2015	2015	2016	2014	2015	2014	2014	2015	2015
Index			IFNPCR	ICE Brent	LLS	LLS													NYMEX WTI	NYMEX WTI	BRENT ICE	NYMEX WTI	IFNPCR	IFNPCR	NYMEX	IFNPCR	NYMEX	IFNPCR
Derivative Liability, Fair Value, Gross Liability	$ 9.1	$ 32.0					$ 9.1	$ 32.0	$ 0	$ 0	$ 0	$ 0.6	$ 2.6	$ 29.4	$ 4.3	$ 2.6	$ 4.2	$ 29.4
Total Volume (in Bcf, Mbbl, millions of gallons, millions of MMBtu)			600,000	200,000	200,000	100,000													3,100,000	7,700,000	400,000	400,000	1,400,000	2,500,000	7,400,000	20,200,000	25,600,000	11,000,000
Average Swap price per unit ($ per unit)			3.86	13.78	4.03	4.03													93.54	90.04	104.95	90.00	4.03	4.07	4.22	4.08	4.14	4.06