Restructuring Costs (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		24 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	$ 18.1
Restructuring Charges	1.8	7.0
Restructuring costs incurred to date			8.8
Increase (Decrease) in Restructuring Liability [Roll Forward]
Number of regional offices created	1
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	3.6
Restructuring Charges	0.5	3.1
Restructuring costs incurred to date			3.6
Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	13.9
Restructuring Charges	1.3	3.3
Restructuring costs incurred to date			4.6
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0.6
Restructuring Charges	0	0.6
Restructuring costs incurred to date			0.6
QEP Energy [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	7.6
Restructuring Charges	0.8	6.8
Restructuring costs incurred to date	0.8		7.6
Increase (Decrease) in Restructuring Liability [Roll Forward]
Balance at December 31, 2012	1.0
Costs paid or otherwise settled	(1.8)
Balance at December 31, 2013	0	1.0	0
QEP Energy [Member] | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	3.3
Restructuring Charges	0.4	2.9
Restructuring costs incurred to date			3.3
QEP Energy [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	3.7
Restructuring Charges	0.4	3.3
Restructuring costs incurred to date			3.7
QEP Energy [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0.6
Restructuring Charges	0	0.6
Restructuring costs incurred to date			0.6
QEP Field Services [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	10.2
Restructuring Charges	0.9	0
Restructuring costs incurred to date	0.9		0.9
Increase (Decrease) in Restructuring Liability [Roll Forward]
Balance at December 31, 2012	0
Costs paid or otherwise settled	(0.1)
Balance at December 31, 2013	0.8	0	0.8
QEP Field Services [Member] | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0
Restructuring Charges	0	0
Restructuring costs incurred to date			0
QEP Field Services [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	10.2
Restructuring Charges	0.9	0
Restructuring costs incurred to date			0.9
QEP Field Services [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0
Restructuring Charges	0	0
Restructuring costs incurred to date			0
QEP Marketing [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0.3
Restructuring Charges	0.1	0.2
Restructuring costs incurred to date	0.1		0.3
Increase (Decrease) in Restructuring Liability [Roll Forward]
Balance at December 31, 2012	0
Costs paid or otherwise settled	(0.1)
Balance at December 31, 2013	0	0	0
QEP Marketing [Member] | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0.3
Restructuring Charges	0.1	0.2
Restructuring costs incurred to date			0.3
QEP Marketing [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0
Restructuring Charges	0	0
Restructuring costs incurred to date			0
QEP Marketing [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0
Restructuring Charges	0	0
Restructuring costs incurred to date			0
QEP Resources [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring costs incurred to date	1.8
Increase (Decrease) in Restructuring Liability [Roll Forward]
Balance at December 31, 2012	1.0
Costs paid or otherwise settled	(2.0)
Balance at December 31, 2013	$ 0.8		$ 0.8