Restructuring Costs (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	$ 18.0
Restructuring and Related Cost, Cost Incurred to Date	11.1
Restructuring Charges	2.3	0.4
Increase (Decrease) in Restructuring Liability [Roll Forward]
Balance at Beginning of Period	0.8
Restructuring Reserve, Accrual Adjustment	2.3
Costs paid or otherwise settled	0
Balance at End of Period	3.1
Number of regional offices created	1
One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	3.6
Restructuring and Related Cost, Cost Incurred to Date	3.6
Restructuring Charges	0	0.3
Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	13.8
Restructuring and Related Cost, Cost Incurred to Date	6.9
Restructuring Charges	2.3	0.1
Termination of Lease [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0.6
Restructuring and Related Cost, Cost Incurred to Date	0.6
Restructuring Charges	0	0
QEP Energy [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	7.6
Restructuring and Related Cost, Cost Incurred to Date	7.6
Restructuring Charges	0	0.3
Increase (Decrease) in Restructuring Liability [Roll Forward]
Balance at Beginning of Period	0
Restructuring Reserve, Accrual Adjustment	0
Costs paid or otherwise settled	0
Balance at End of Period	0
QEP Energy [Member] | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	3.3
Restructuring and Related Cost, Cost Incurred to Date	3.3
Restructuring Charges	0	0.2
QEP Energy [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	3.7
Restructuring and Related Cost, Cost Incurred to Date	3.7
Restructuring Charges	0	0.1
QEP Energy [Member] | Termination of Lease [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0.6
Restructuring and Related Cost, Cost Incurred to Date	0.6
Restructuring Charges	0	0
QEP Field Services [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	10.1
Restructuring and Related Cost, Cost Incurred to Date	3.2
Restructuring Charges	2.3	0
Increase (Decrease) in Restructuring Liability [Roll Forward]
Balance at Beginning of Period	0.8
Restructuring Reserve, Accrual Adjustment	2.3
Costs paid or otherwise settled	0
Balance at End of Period	3.1
QEP Field Services [Member] | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0
Restructuring and Related Cost, Cost Incurred to Date	0
Restructuring Charges	0	0
QEP Field Services [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	10.1
Restructuring and Related Cost, Cost Incurred to Date	3.2
Restructuring Charges	2.3	0
QEP Field Services [Member] | Termination of Lease [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0
Restructuring and Related Cost, Cost Incurred to Date	0
Restructuring Charges	0	0
QEP Marketing [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0.3
Restructuring and Related Cost, Cost Incurred to Date	0.3
Restructuring Charges	0	0.1
Increase (Decrease) in Restructuring Liability [Roll Forward]
Balance at Beginning of Period	0
Restructuring Reserve, Accrual Adjustment	0
Costs paid or otherwise settled	0
Balance at End of Period	0
QEP Marketing [Member] | One-time Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0.3
Restructuring and Related Cost, Cost Incurred to Date	0.3
Restructuring Charges	0	0.1
QEP Marketing [Member] | Employee Relocation [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0
Restructuring and Related Cost, Cost Incurred to Date	0
Restructuring Charges	0	0
QEP Marketing [Member] | Termination of Lease [Member]
Restructuring Cost and Reserve [Line Items]
Estimated restructuring costs	0
Restructuring and Related Cost, Cost Incurred to Date	0
Restructuring Charges	$ 0	$ 0