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Debt (Tables)
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Debt Outstanding [Table Text Block]
As of the indicated dates, the principal amount of QEP's debt consisted of the following:
June 30,
2020		December 31,
2019
(in millions)
Revolving Credit Facility due 2022$—  $—  
6.875% Senior Notes due 2021275.3  382.4  
5.375% Senior Notes due 2022465.1  500.0  
5.25% Senior Notes due 2023636.8  650.0  
5.625% Senior Notes due 2026500.0  500.0  
Less: unamortized discount and unamortized debt issuance costs(12.9) (16.8) 
Total principal amount of debt (including current portion)1,864.3  2,015.6  
Less: current portion of long-term debt(274.9) —  
Total long-term debt outstanding$1,589.4  $2,015.6