QEP Midstream (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended		12 Months Ended
	Dec. 31, 2013	Aug. 14, 2013	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Offering Costs, Partnership Interests		$ 29.3
Partners' Capital Account, Units, Sold to Underwriters		3,000,000
Partners Capital Account Units Sold In Public Offering Price Per Unit		$ 21.00
Partners' Capital Account, Public Sale of Units Net of Offering Costs		390.7	449.6
net proceeds from issuance of units to underwriters		58.9
Offering Costs from issuance of Units to Underwriters		4.1
Noncontrolling Interest, Ownership Percentage by Parent	57.80%	63.30%	57.80%
Affiliate Payment for General and Administrative Services		13.8
Limited Liability Company (LLC) or Limited Partnership (LP), Managing Member or General Partner, Ownership Interest			2.00%
General Partners' Capital Account, Units Issued		1,090,000
Limited Partners' Capital Account, Units Issued		6,701,750
Membership Interest Related to Common Units		12.30%
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest	6.80%	49.00%
Other Ownership Interests, Units Issued		26,705,000
Proceeds from Issuance of Common Limited Partners Units		420.0	483.0
Payments of Stock Issuance Costs			(33.4)
Repayments of Related Party Debt			(95.5)
Net proceeds distributed to parent from the Offering			351.1
Partners' Capital Account, Units, Sold in Public Offering		20,000,000
541611 Administrative Management and General Management Consulting Services [Member]
Noncontrolling Interest [Line Items]
Affiliate Payment for General and Administrative Services		1.4
QEP Midstream's Credit Facility [Member]
Noncontrolling Interest [Line Items]
Payments of Debt Issuance Costs			$ (3.0)