Debt (Tables)

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Debt Outstanding

As of the indicated dates, the principal amount of QEP's debt, including amounts outstanding under its revolving credit facility and term loan agreement, consisted of the following:

	December 31,
	2012			2011
	(in millions)
Revolving credit facility due 2016	$	690.0		$	606.5
Term loan due 2017	300.0			—
6.05% Senior Notes due 2016	176.8			176.8
6.80% Senior Notes due 2018	134.0			138.6
6.80% Senior Notes due 2020	136.0			138.0
6.875% Senior Notes due 2021	625.0			625.0
5.375% Senior Notes due 2022	500.0			—
5.25% Senior Notes due 2023	650.0			—
Total principal amount of debt	3,211.8			1,684.9
Less unamortized discount	(4.9		)	(5.5		)
Total long-term debt outstanding	$	3,206.9		$	1,679.4