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Employee Benefits (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
May 18, 2010
Dec. 31, 2011
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2011
Investment Grade Long-Term Debt [Member]
Dec. 31, 2011
Pension Benefits [Member]
Dec. 31, 2010
Pension Benefits [Member]
Dec. 31, 2009
Pension Benefits [Member]
Dec. 31, 2011
Pension Benefits [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Pension Benefits [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Pension Benefits [Member]
Domestic Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Domestic Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Developed Market Foreign Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Developed Market Foreign Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Emerging Market Foreign Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Emerging Market Foreign Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2010
Pension Benefits [Member]
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2011
Pension Benefits [Member]
Investment Grade Long-Term Debt [Member]
Dec. 31, 2010
Pension Benefits [Member]
Investment Grade Long-Term Debt [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 1 [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 1 [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 1 [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 1 [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 1 [Member]
Domestic Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 1 [Member]
Domestic Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 1 [Member]
Developed Market Foreign Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 1 [Member]
Developed Market Foreign Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 1 [Member]
Emerging Market Foreign Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 1 [Member]
Emerging Market Foreign Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 1 [Member]
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 1 [Member]
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 1 [Member]
Investment Grade Long-Term Debt [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 1 [Member]
Investment Grade Long-Term Debt [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 2 [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 2 [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 2 [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 2 [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 2 [Member]
Domestic Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 2 [Member]
Domestic Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 2 [Member]
Developed Market Foreign Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 2 [Member]
Developed Market Foreign Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 2 [Member]
Emerging Market Foreign Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 2 [Member]
Emerging Market Foreign Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 2 [Member]
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 2 [Member]
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 2 [Member]
Investment Grade Long-Term Debt [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 2 [Member]
Investment Grade Long-Term Debt [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 3 [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 3 [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 3 [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 3 [Member]
Cash and Cash Equivalents [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 3 [Member]
Domestic Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 3 [Member]
Domestic Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 3 [Member]
Developed Market Foreign Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 3 [Member]
Developed Market Foreign Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 3 [Member]
Emerging Market Foreign Equity Securities [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 3 [Member]
Emerging Market Foreign Equity Securities [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 3 [Member]
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 3 [Member]
Investment Grade Intermediate Term Debt [Member]
Dec. 31, 2011
Pension Benefits [Member]
Level 3 [Member]
Investment Grade Long-Term Debt [Member]
Dec. 31, 2010
Pension Benefits [Member]
Level 3 [Member]
Investment Grade Long-Term Debt [Member]
Dec. 31, 2011
Other Pension Plans, Defined Benefit [Member]
Dec. 31, 2011
Other Pension Plans, Postretirement or Supplemental Plans, Defined Benefit [Member]
Dec. 31, 2011
Other Postretirement Benefits [Member]
Dec. 31, 2010
Other Postretirement Benefits [Member]
Dec. 31, 2009
Other Postretirement Benefits [Member]
Compensation and Retirement Disclosure [Abstract]                                                                                                                                      
Liabilities related to the unfunded portions of the pension plans and other postretirement benefits with corresponding amounts in AOCI at Spin Off     $ 54.9                                                                                                                                
Number of employees under coverage in the defined benefit pension and postretirement medical plans in association with the spin off (in heads)     190                                                                                                                                
Description of plans Pension-plan benefits are based on the employee's age at retirement, years of service and highest earnings in a consecutive 72 semimonthly pay period during the 10 years preceding retirement. QEP pension plans include a qualified and a nonqualified retirement plan. Postretirement health care benefits and life insurance are provided only to employees hired before January 1, 1997. The Company pays a portion of the costs of health-care benefits determined by an employee's years of service. The Company has capped its exposure to increasing medical care and life insurance costs by paying a fixed dollar monthly contribution toward these retiree benefits. The Company contribution is prorated based on an employee's years of service at retirement; only those employees with 25 or more years of service receive the maximum Company contribution.                                                                                                                                    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]                                                                                                                                      
Pension contributions           14.8 1.6                                                                                   14.8 1.6                         14.8   0 0  
Expected contributions in next fiscal year                                                                                                                             6.3 1.3      
Funded status unfunded unfunded                                                                                                                                  
Accumulated benefit obligation 78.3 57.4                                                                                                                                  
Change in benefit obligation                                                                                                                                      
Benefit obligation at January 1,           78.0 0                                                                                                                   4.5 0  
Service cost           2.9 1.3 0                                                                                                                 0.1 0.1 0
Interest cost           4.5 2.1 0                                                                                                                 0.3 0.1 0
Change in plan assumptions           19.6 (1.1)                                                                                                                   0 (0.1)  
Transfer due to Spin-off           0 75.7                                                                                   0 25.2                             0 4.4  
Benefit payments (0.2)         (0.2) 0                                                                                                                   0 0  
Actuarial loss (gain)           (0.7) 0                                                                                                                   1.0 0  
Benefit obligation at December 31,           104.1 78.0 0                                                                                                                 5.9 4.5 0
Change in plan assets                                                                                                                                      
Fair value of plan assets at January 1,           30.9 0   0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 30.9 0 0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5     0 0  
Actual gain (loss) on plan assets           (1.3) 4.1                                                                                   (1.3) 4.1                             0 0  
Company contributions to the plan           14.8 1.6                                                                                   14.8 1.6                         14.8   0 0  
Benefit payments (0.2)         (0.2) 0                                                                                                                   0 0  
Transfer due to Spin-off           0 25.2                                                                                                                   0 0  
Fair value of plan assets at December 31,           44.2 30.9 0 0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 44.2 30.9 0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5     0 0 0
Underfunded status (current and long-term)           (59.9) (47.1)                                                                                                                   (5.9) (4.5)  
Amounts recognized in balance sheets                                                                                                                                      
Accounts payable and accrued expenses           (1.3) 0                                                                                                                   0 0  
Other long-term liabilities           (58.6) (47.1)                                                                                                                   (5.9) (4.5)  
Total amount recognized in balance sheet           (59.9) (47.1)                                                                                                                   (5.9) (4.5)  
Amounts recognized in accumulated other comprehensive income (AOCI)                                                                                                                                      
Net actuarial loss (gain)           18.6 (4.2)                                                                                                                   1.0 (0.1)  
Prior service cost           42.6 47.8                                                                                                                   3.8 4.2  
Total amount recognized in AOCI           61.2 43.6                                                                                                                   4.8 4.1  
Components of net periodic benefit cost                                                                                                                                      
Service cost           2.9 1.3 0                                                                                                                 0.1 0.1 0
Interest cost           4.5 2.1 0                                                                                                                 0.3 0.1 0
Expected return on plan assets           (2.6) (1.1) 0                                                                                                                 0 0 0
Amortization of prior service costs           5.3 2.6 0                                                                                                                 0.3 0.2 0
Net periodic benefit cost           10.1 4.9 0                                                                                                                 0.7 0.4 0
Components recognized in other comprehensive income                                                                                                                                      
Net loss (gain)           22.9 (4.2) 0                                                                                                                 1.0 0 0
Prior service cost           0 50.4 0                                                                                                                 0 4.3 0
Recognized prior service cost           (5.3) (2.6) 0                                                                                                                 (0.3) (0.1) 0
Total amount recognized in other comprehensive income           17.6 43.6 0                                                                                                                 0.7 4.2 0
Reclassifications from AOCI in next fiscal year [Abstract]                                                                                                                                      
Cost to be amortized from accumulated other comprehensive income into net periodic benefit cost in next fiscal year           6.0                                                                                                                          
Amortization of prior service cost recognition           5.3                                                                                                                     0.4    
Amortization of net actuarial losses           0.7                                                                                                                          
Assumptions for benefit obligations                                                                                                                                      
Discount rate           4.54% 5.80%                                                                                                                   4.70% 5.80%  
Rate of increase in compensation           3.60% 3.60%                                                                                                                   0.00% 0.00%  
Assumptions for benefit costs                                                                                                                                      
Discount rate           5.80% 5.70% 0.00%                                                                                                                 5.80% 5.70% 0.00%
Expected long-term return on plan assets           7.50% 7.50% 0.00%                                                                                                                 0.00% 0.00% 0.00%
Rate of increase in compensation           3.60% 3.60% 0.00%                                                                                                                 0.00% 0.00% 0.00%
Assumed health care cost trend rates [Abstract]                                                                                                                                      
Health care cost trend rate                                                                                                                                 8.00% 8.00%  
Ultimate health care cost trend rate                                                                                                                                 5.00% 5.00%  
Year rate reaches ultimate trend rate                                                                                                                                 2014 2013  
Effect of one-percentage point change in assumed health care cost trend rate [Abstract]                                                                                                                                      
Effect of one percentage point increase in the health-care inflation rate on service and interest costs           0                                                                                                                     0    
Effect of one percentage point decrease in the health-care inflation rate on service and interest costs           0                                                                                                                     0    
Effect of one percentage point increase in the health-care inflation rate on accumulated postretirement benefit obligation           0                                                                                                                     0    
Effect of one percentage point decrease in the health-care inflation rate on accumulated postretirement benefit obligation           0                                                                                                                     0    
Plan Assets                                                                                                                                      
Performance measurement period for each investment manager A three-year period or a complete market cycle, whichever is shorter.                                                                                                                                    
Debt securities, average maturities, minimum       5Y 10Y                                                                                                                            
Debt securities, average maturities, maximum       10Y                                                                                                                              
Fair Value of Plan Assets [Abstract]                                                                                                                                      
Fair value of plan assets           44.2 30.9 0 0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 44.2 30.9 0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5     0 0 0
Percentage of total           100.00% 100.00%   0.00% 0.00% 40.00% 40.00% 24.00% 25.00% 5.00% 5.00% 16.00% 15.00% 15.00% 15.00%                                                                                              
Changes in fair value of Level 3 Investments                                                                                                                                      
Fair value of plan assets at January 1,           30.9 0   0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 30.9 0 0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5     0 0  
Transfer due to Spin-off           0 75.7                                                                                   0 25.2                             0 4.4  
Employer contributions           14.8 1.6                                                                                   14.8 1.6                         14.8   0 0  
Unrealized gains and losses           (1.3) 4.1                                                                                   (1.3) 4.1                             0 0  
Benefits paid (0.2)         (0.2) 0                                                                                                                   0 0  
Fair value of plan assets at December 31,           44.2 30.9 0 0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 44.2 30.9 0 0 17.6 12.4 10.8 7.8 2.2 1.6 6.9 4.6 6.7 4.5     0 0 0
Expected Benefit Payments                                                                                                                                      
2012           1.9                                                                                                                     0.1    
2013           2.0                                                                                                                     0.1    
2014           2.9                                                                                                                     0.2    
2015           3.2                                                                                                                     0.2    
2016           4.1                                                                                                                     0.3    
2017 through 2021           38.1                                                                                                                     1.8    
Employee Investment Plan                                                                                                                                      
Plan description QEP employees may participate in the QEP Employee Investment Plan EIP, a defined-contribution plan. The EIP allows eligible employees to purchase shares of QEP common stock or other investments through payroll deduction at the current fair market value on the transaction date. The Company currently contributes an overall match of 100 of employees' contribution up to a maximum of 6 of their qualifying earnings. In addition, from time-to-time at the discretion of management, the Company may contribute a discretionary portion beyond the company match. The EIP trustee purchases QEP shares on the open market with cash received.                                                                                                                                    
Defined contribution plan expense $ 6.2 $ 4.2