Restructuring Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			$ 18.4
Restructuring costs incurred from inception to reporting date			13.7
Restructuring Charges	2.6	0.2	4.8	0.6
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			3.6
Restructuring costs incurred from inception to reporting date			3.6
Restructuring Charges	0	0.1	0	0.4
Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			14.2
Restructuring costs incurred from inception to reporting date			9.5
Restructuring Charges	2.6	0.1	4.8	0.2
Termination of Lease [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			0.6
Restructuring costs incurred from inception to reporting date			0.6
Restructuring Charges	0	0	0	0
QEP Energy [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			7.6
Restructuring costs incurred from inception to reporting date			7.6
Restructuring Charges	0	0.2	0	0.5
QEP Energy [Member] | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			3.3
Restructuring costs incurred from inception to reporting date			3.3
Restructuring Charges	0	0.1	0	0.3
QEP Energy [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			3.7
Restructuring costs incurred from inception to reporting date			3.7
Restructuring Charges	0	0.1	0	0.2
QEP Energy [Member] | Termination of Lease [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			0.6
Restructuring costs incurred from inception to reporting date			0.6
Restructuring Charges	0	0	0	0
QEP Field Services [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			10.5
Restructuring costs incurred from inception to reporting date			5.8
Restructuring Charges	2.6	0	4.8	0
QEP Field Services [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			10.5
Restructuring costs incurred from inception to reporting date			5.8
Restructuring Charges	2.6	0	4.8	0
QEP Marketing [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			0.3
Restructuring costs incurred from inception to reporting date			0.3
Restructuring Charges	0	0	0	0
QEP Marketing [Member] | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs			0.3
Restructuring costs incurred from inception to reporting date			0.3
Restructuring Charges	$ 0	$ 0	$ 0	$ 0.1