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Derivative Contracts (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified
 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Interest rate swap [Member]
Jun. 30, 2011
Interest rate swap [Member]
Jun. 30, 2012
Interest rate swap [Member]
Jun. 30, 2011
Interest rate swap [Member]
Jun. 30, 2012
QEP Energy [Member]
Natural gas derivative contracts [Member]
Jun. 30, 2011
QEP Energy [Member]
Natural gas derivative contracts [Member]
Jun. 30, 2012
QEP Energy [Member]
Natural gas derivative contracts [Member]
Jun. 30, 2011
QEP Energy [Member]
Natural gas derivative contracts [Member]
Jun. 30, 2012
QEP Energy [Member]
Oil derivative contracts [Member]
Jun. 30, 2011
QEP Energy [Member]
Oil derivative contracts [Member]
Jun. 30, 2012
QEP Energy [Member]
Oil derivative contracts [Member]
Jun. 30, 2011
QEP Energy [Member]
Oil derivative contracts [Member]
Jun. 30, 2012
QEP Energy [Member]
NGL derivative contracts [Member]
Jun. 30, 2011
QEP Energy [Member]
NGL derivative contracts [Member]
Jun. 30, 2012
QEP Energy [Member]
NGL derivative contracts [Member]
Jun. 30, 2011
QEP Energy [Member]
NGL derivative contracts [Member]
Jun. 30, 2012
QEP Field Services [Member]
NGL derivative contracts [Member]
Jun. 30, 2011
QEP Field Services [Member]
NGL derivative contracts [Member]
Jun. 30, 2012
QEP Field Services [Member]
NGL derivative contracts [Member]
Jun. 30, 2011
QEP Field Services [Member]
NGL derivative contracts [Member]
Jun. 30, 2012
QEP Marketing [Member]
Natural gas derivative contracts [Member]
Jun. 30, 2011
QEP Marketing [Member]
Natural gas derivative contracts [Member]
Jun. 30, 2012
QEP Marketing [Member]
Natural gas derivative contracts [Member]
Jun. 30, 2011
QEP Marketing [Member]
Natural gas derivative contracts [Member]
Jun. 30, 2012
Realized and unrealized gains on commodity derivative instruments [Member]
Jun. 30, 2011
Realized and unrealized gains on commodity derivative instruments [Member]
Jun. 30, 2012
Realized and unrealized gains on commodity derivative instruments [Member]
Jun. 30, 2011
Realized and unrealized gains on commodity derivative instruments [Member]
Jun. 30, 2012
Accumulated other comprehensive income (loss) [Member]
Jun. 30, 2011
Accumulated other comprehensive income (loss) [Member]
Jun. 30, 2012
Accumulated other comprehensive income (loss) [Member]
Jun. 30, 2011
Accumulated other comprehensive income (loss) [Member]
Jun. 30, 2012
Natural Gas Sales [Member]
Jun. 30, 2011
Natural Gas Sales [Member]
Jun. 30, 2012
Natural Gas Sales [Member]
Jun. 30, 2011
Natural Gas Sales [Member]
Jun. 30, 2012
Oil Sales [Member]
Jun. 30, 2011
Oil Sales [Member]
Jun. 30, 2012
Oil Sales [Member]
Jun. 30, 2011
Oil Sales [Member]
Jun. 30, 2012
Marketing Purchases [Member]
Jun. 30, 2011
Marketing Purchases [Member]
Jun. 30, 2012
Marketing Purchases [Member]
Jun. 30, 2011
Marketing Purchases [Member]
Jun. 30, 2012
Interest and Other Income [Member]
Jun. 30, 2011
Interest and Other Income [Member]
Jun. 30, 2012
Interest and Other Income [Member]
Jun. 30, 2011
Interest and Other Income [Member]
Jun. 30, 2012
Swap [Member]
Natural Gas Sales (MMbtu) [Member]
2012 [Member]
NYMEX [Member]
Btu
Jun. 30, 2012
Swap [Member]
Natural Gas Sales (MMbtu) [Member]
2012 [Member]
IFPEPL [Member]
Btu
Jun. 30, 2012
Swap [Member]
Natural Gas Sales (MMbtu) [Member]
2012 [Member]
IFNPCR [Member]
Btu
Jun. 30, 2012
Swap [Member]
Natural Gas Sales (MMbtu) [Member]
2012 [Member]
IFCNPTE [Member]
Btu
Jun. 30, 2012
Swap [Member]
Natural Gas Sales (MMbtu) [Member]
2013 [Member]
IFNPCR [Member]
Btu
Jun. 30, 2012
Swap [Member]
Natural Gas Sales (MMbtu) [Member]
2013 [Member]
NYMEX WTI [Member]
Btu
Jun. 30, 2012
Swap [Member]
Oil Sales (Bbls) [Member]
2012 [Member]
NYMEX WTI [Member]
bbl
Jun. 30, 2012
Swap [Member]
Oil Sales (Bbls) [Member]
2013 [Member]
NYMEX WTI [Member]
bbl
Jun. 30, 2012
Swap [Member]
NGL Sales [Member]
2012 [Member]
Mt. Belvieu Ethane [Member]
gal
Jun. 30, 2012
Swap [Member]
NGL Sales [Member]
2012 [Member]
Mt. Belvieu Propane [Member]
gal
Jun. 30, 2012
Swap [Member]
QEP Field Services [Member]
2012 [Member]
Mt. Belvieu Ethane [Member]
gal
Jun. 30, 2012
Swap [Member]
QEP Field Services [Member]
2012 [Member]
Mt. Belvieu Propane [Member]
gal
Jun. 30, 2012
Swap [Member]
QEP Marketing [Member]
2012 [Member]
IFNPCR [Member]
Btu
Jun. 30, 2012
Swap [Member]
QEP Marketing [Member]
2013 [Member]
IFNPCR [Member]
Btu
Jun. 30, 2012
Swap [Member]
QEP Resources [Member]
Jun. 30, 2012
Swap [Member]
Purchased Gas and Oil Expense [Member]
2012 [Member]
IFNPCR [Member]
Btu
Jun. 30, 2012
Swap [Member]
Purchased Gas and Oil Expense [Member]
2013 [Member]
IFNPCR [Member]
Btu
Jun. 30, 2012
Interest Rate Swap [Member]
Short-term [Member]
Dec. 31, 2011
Interest Rate Swap [Member]
Short-term [Member]
Jun. 30, 2012
Interest Rate Swap [Member]
Long-term [Member]
Dec. 31, 2011
Interest Rate Swap [Member]
Long-term [Member]
Jun. 30, 2012
Commodity Contract [Member]
Short-term [Member]
Dec. 31, 2011
Commodity Contract [Member]
Short-term [Member]
Jun. 30, 2012
Commodity Contract [Member]
Long-term [Member]
Dec. 31, 2011
Commodity Contract [Member]
Long-term [Member]
Jun. 30, 2012
Commodity Contract [Member]
Oil Sales (Bbls) [Member]
2012 [Member]
NYMEX WTI [Member]
bbl
Jun. 30, 2012
QEP Energy [Member]
Fixed-price swaps [Member]
Natural Gas Sales (MMbtu) [Member]
Jun. 30, 2011
QEP Energy [Member]
Fixed-price swaps [Member]
Natural Gas Sales (MMbtu) [Member]
Jun. 30, 2012
QEP Energy [Member]
Fixed-price swaps [Member]
Natural Gas Sales (MMbtu) [Member]
Jun. 30, 2011
QEP Energy [Member]
Fixed-price swaps [Member]
Natural Gas Sales (MMbtu) [Member]
Jun. 30, 2012
QEP Energy [Member]
Fixed-price swaps [Member]
Oil Sales (Bbls) [Member]
Jun. 30, 2011
QEP Energy [Member]
Fixed-price swaps [Member]
Oil Sales (Bbls) [Member]
Jun. 30, 2012
QEP Energy [Member]
Fixed-price swaps [Member]
Oil Sales (Bbls) [Member]
Jun. 30, 2011
QEP Energy [Member]
Fixed-price swaps [Member]
Oil Sales (Bbls) [Member]
Jun. 30, 2012
QEP Energy [Member]
Fixed-price swaps [Member]
NGL Sales [Member]
Jun. 30, 2011
QEP Energy [Member]
Fixed-price swaps [Member]
NGL Sales [Member]
Jun. 30, 2012
QEP Energy [Member]
Fixed-price swaps [Member]
NGL Sales [Member]
Jun. 30, 2011
QEP Energy [Member]
Fixed-price swaps [Member]
NGL Sales [Member]
Jun. 30, 2012
QEP Energy [Member]
Costless Collars [Member]
Natural Gas Sales (MMbtu) [Member]
Jun. 30, 2011
QEP Energy [Member]
Costless Collars [Member]
Natural Gas Sales (MMbtu) [Member]
Jun. 30, 2012
QEP Energy [Member]
Costless Collars [Member]
Natural Gas Sales (MMbtu) [Member]
Jun. 30, 2011
QEP Energy [Member]
Costless Collars [Member]
Natural Gas Sales (MMbtu) [Member]
Jun. 30, 2012
QEP Energy [Member]
Costless Collars [Member]
Oil Sales (Bbls) [Member]
Jun. 30, 2011
QEP Energy [Member]
Costless Collars [Member]
Oil Sales (Bbls) [Member]
Jun. 30, 2012
QEP Energy [Member]
Costless Collars [Member]
Oil Sales (Bbls) [Member]
Jun. 30, 2011
QEP Energy [Member]
Costless Collars [Member]
Oil Sales (Bbls) [Member]
Jun. 30, 2012
QEP Field Services [Member]
Fixed-price swaps [Member]
Ethane Sales (Gals) [Member]
Jun. 30, 2011
QEP Field Services [Member]
Fixed-price swaps [Member]
Ethane Sales (Gals) [Member]
Jun. 30, 2012
QEP Field Services [Member]
Fixed-price swaps [Member]
Ethane Sales (Gals) [Member]
Jun. 30, 2011
QEP Field Services [Member]
Fixed-price swaps [Member]
Ethane Sales (Gals) [Member]
Jun. 30, 2012
QEP Field Services [Member]
Fixed-price swaps [Member]
Propane Sales (Gals) [Member]
Jun. 30, 2011
QEP Field Services [Member]
Fixed-price swaps [Member]
Propane Sales (Gals) [Member]
Jun. 30, 2012
QEP Field Services [Member]
Fixed-price swaps [Member]
Propane Sales (Gals) [Member]
Jun. 30, 2011
QEP Field Services [Member]
Fixed-price swaps [Member]
Propane Sales (Gals) [Member]
Jun. 30, 2012
Term Loan due 2017 [Member]
Dec. 31, 2011
Term Loan due 2017 [Member]
Derivative Contracts [Abstract]                                                                                                                                                                                                                    
Forecasted production from proved reserves (in hundredths) 100.00%                                                                                                                                                                                                                  
Unrealized gains on derivative contracts $ 249.8                                                                                                                                                                                                                  
Unrealized gains on derivative contracts, net of tax 156.9                                                                                                                                                                                                                  
Notional amount of interest rate derivatives 300.0                                                                                                                               300.0                                                                                  
Debt Instrument [Line Items]                                                                                                                                                                                                                    
Principal amount of debt 1,871.8 1,684.9                                                                                                                                                                                                             300.0 0
Derivative [Line Items]                                                                                                                                                                                                                    
Derivative volumes as a percent of production (in hundredths)                                                                                                                                                         67.00% 46.00% 63.00% 44.00% 35.00% 3.00% 36.00% 2.00% 18.00% 0.00% 17.00% 0.00% 0.00% 12.00% 0.00% 12.00% 28.00% 31.00% 22.00% 33.00% 15.00% 0.00% 27.00% 0.00% 59.00% 0.00% 76.00% 0.00%    
Derivatives, Fair Value [Line Items]                                                                                                                                                                                                                    
Year                                                                                                     2012 2012 2012 2012 2013 2013 2012 2013 2012 2012 2012 2012 2012 2013   2012 2013                 2012                                                            
Index                                                                                                     NYMEX IFPEPL (1) [1] IFNPCR (2) [2] IFCNPTE (3) [3] IFNPCR (2) [2] NYMEX NYMEX WTI NYMEX WTI Mt. Belvieu Ethane Mt. Belvieu Propane Mt. Belvieu Ethane Mt. Belvieu Propane IFNPCR (1) [2] IFNPCR (1) [2]   IFNPCR (1) [2] IFNPCR (1) [2]                 NYMEX WTI                                                            
Derivative Contracts - Volumes and Prices                                                                                                                                                                                                                    
Total Volume (in Bcf, Mbbl, millions of gallons, millions of MMBtu)                                                                                                     39,900,000 4,900,000 45,400,000 5,500,000 65,700,000 [2] 29,200,000 900,000 900,000 7,700,000 11,600,000 7,700,000 3,900,000 1,800,000 1,200,000   700,000 [1] 100,000 [1]                 700,000                                                            
Average Swap price per unit ($ per unit)                                                                                                     $ 4.66 $ 4.14 $ 4.61 $ 2.66 $ 5.66 [2] $ 3.68 $ 97.03 $ 104.12 $ 0.64 $ 1.28 $ 0.64 $ 1.28 $ 4.06 $ 4.57   $ 2.97 [1] $ 2.59 [1]                                                                              
Collars Floor Price ($ per unit)                                                                                                                                                       $ 87.50                                                            
Collars Ceiling Price ($ per unit)                                                                                                                                                       $ 115.36                                                            
Notional amount 300.0                                                                                                                               300.0                                                                                  
Maturity                                                                                                                                 Mar. 31, 2017                                                                                  
Fixed Rate Paid (in hundredths)                                                                                                                                 1.07%                                                                                  
Variable Rate Received                                                                                                                                 One month LIBOR                                                                                  
Fair Value of Derivative Contracts, Gross [Abstract]                                                                                                                                                                                                                    
Derivative Asset, Fair Value, Gross 349.7 407.6                                                                                                                                   0 0 0 0 272.2 284.1 77.5 123.5                                                              
Derivative Liability, Fair Value, Gross 10.0 11.7                                                                                                                                   2.3 0 2.0 0 4.0 11.7 1.7 0                                                              
Derivatives not designated as hedging instruments - Commodity derivatives [Abstract]                                                                                                                                                                                                                    
Realized gain (loss) on commodity derivative contracts             111.9 (27.6) 197.6 (58.8) 2.2 0 (0.5) 0 2.7 0 3.1 0 3.3 0 4.4 0 0.6 0 4.1 0 120.7 (27.6) 208.7 (58.8)                                                                                                                                                        
Unrealized gain (loss) on commodity derivative contracts     (4.3) 0 (4.3) 0 (78.4) 27.6 53.9 58.8 38.6 0 27.1 0 4.9 0 7.8 0 1.5 0 4.5 0 (0.7) 0 0.9 0 (34.1) 27.6 94.2 58.8                                                                                                                                                        
Total gain (loss) on commodity derivative instruments                                                     86.6 0 302.9 0                                                                                                                                                        
Gain on derivative instruments for the effective portion of hedge recognized in AOCI [Abstract]                                                                                                                                                                                                                    
Gain on derivative instruments for the effective portion of hedge recognized in AOCI                                                             0 61.3 0 61.5                                                                                                                                                
Gain recognized in income for the ineffective portion of hedges [Abstract]                                                                                                                                                                                                                    
Gain recognized in income for the ineffective portion of hedges                                                                                             0 0.3 0 0.1                                                                                                                
Gain reclassified from AOCI into income for effective portion of hedge [Abstract]                                                                                                                                                                                                                    
Gain reclassified from AOCI into income for effective portion of hedge                                                                     0 64.4 0 137.5 0 0.1 0 0.1 0 0.5 0 3.9                                                                                                                        
Fair value of frozen derivative to be settled and reclassified within twelve months $ 120.0                                                                                                                                                                                                                  
[1] Inside FERC monthly settlement index for the Panhandle Eastern Pipeline Company.
[2] Inside FERC monthly settlement index for the Northwest Pipeline Corp. Rocky Mountains.
[3] Inside FERC monthly settlement index for Centerpoint East.