Discontinued Operations Income Statement Impact Of Discontinued Operations (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
NGL sales										$ 83.5	$ 80.0	$ 223.3
Other revenues										6.2	15.1	11.1
Purchased oil, gas and NGL sales										101.2	620.8	913.9
Total Revenues		$ 399.7	$ 382.4	$ 333.7	$ 261.3	$ 468.3	$ 507.6	$ 574.6	$ 468.1	1,377.1	2,018.6	3,293.2
Purchased oil, gas and NGL expense										(105.5)	(626.8)	(910.1)
Lease operating expense										(224.7)	(238.8)	(240.1)
Oil, gas and NGL transportation and other handling costs										(289.2)	(291.3)	(277.6)
Gathering and other expense										5.0	5.8	6.7
General and administrative										198.4	181.1	204.4
Production and property taxes										94.8	117.6	205.2
Total Operating Expenses										2,984.7	2,400.8	3,991.9
Net gain (loss) from asset sales										5.0	4.6	(148.6)
OPERATING INCOME (LOSS)		$ (36.9)	$ (93.6)	$ (92.9)	$ (1,379.2)	$ (144.6)	$ (87.7)	$ (16.7)	$ (128.6)	(1,602.6)	(377.6)	(847.3)
Realized and unrealized gains (losses) on derivative contracts										(233.0)	277.2	363.3
Interest and other income										25.6	3.0	12.8
Income from unconsolidated affiliates										0.0	0.0	0.3
Loss from early extinguishment of debt										0.0	0.0	(2.0)
Interest expense										143.2	145.6	169.1
Net income attributable to noncontrolling interest										0.0	0.0	21.6
NET INCOME FROM DISCONTINUED OPERATIONS, NET OF INCOME TAX										$ 0.0	$ 0.0	1,193.9
Income from discontinued operations before income taxes attributable to QEP from QEP Midstream	[1]											$ 28.9
Ownership Percentage	[1]											57.80%
Midstream Business Held For Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Oil and Gas Property and Equipment												$ 55.2
NGL sales												109.3
Other revenues												140.9
Purchased oil, gas and NGL sales	[2]											(47.1)
Total Revenues												203.1
Purchased oil, gas and NGL expense	[2]											(48.5)
Lease operating expense	[2]											(5.5)
Oil, gas and NGL transportation and other handling costs	[2]											(55.4)
Gathering and other expense												85.9
General and administrative												42.1
Production and property taxes												7.3
Depreciation, depletion and amortization												45.9
Total Operating Expenses												71.8
Net gain (loss) from asset sales												1,793.4
OPERATING INCOME (LOSS)												1,924.7
Interest and other income												0.3
Income from unconsolidated affiliates												4.9
Loss from early extinguishment of debt												(2.4)
Interest Income (Expense), Net												(3.8)
INCOME FROM DISCONTINUED OPERATIONS BEFORE INCOME TAXES	[1]											1,923.7
Income taxes												(708.2)
NET INCOME FROM DISCONTINUED OPERATIONS												1,215.5
Net income attributable to noncontrolling interest												(21.6)
NET INCOME FROM DISCONTINUED OPERATIONS, NET OF INCOME TAX												$ 1,193.9

[1] Includes income from discontinued operations before income taxes attributable to QEP from QEP Midstream (of which QEP owned 57.8%) of $28.9 million for the year ended December 31, 2014.

[2] Includes discontinued intercompany eliminations.