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Number of shares of equity interests issued or issuable to acquire entity.

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash inflow associated with the amount received from entity's raising of capital via private rather than public placement.

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The proceeds from the sale of an interest in a unit of partnership.

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Energy measure of oil and natural gas production reserves.

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Organization and Nature of Operations (Details) $ / shares in Units, bbl / d in Thousands, bbl in Thousands, a in Thousands, $ in Millions						12 Months Ended
	Dec. 12, 2017 USD ($) $ / shares shares	Jun. 26, 2017	Jun. 20, 2017 USD ($) $ / shares shares	Apr. 03, 2017 USD ($) bbl / d mi bbl	Sep. 20, 2016 $ / shares shares	Dec. 31, 2017 a MMBTU customer mi
Debt Instrument [Line Items]
Proceeds from private placement, gross			$ 142.6
Proceeds from private placement, net			$ 138.0
Net proceeds from unit offering	$ 174.1
Payments of stock issuance costs	$ 0.7
Common Units
Debt Instrument [Line Items]
Sold (in units) \| shares	3,680,000
Price ($ per unit) \| $ / shares	$ 47.50
Colorado River DevCo LP
Debt Instrument [Line Items]
Interest in partnership			20.00%
Controlling interest		100.00%				100.00%
San Juan River DevCo LP
Debt Instrument [Line Items]
Controlling interest						25.00%
Noncontrolling interest						75.00%
Green River DevCo LP
Debt Instrument [Line Items]
Controlling interest						25.00%
Noncontrolling interest						75.00%
Laramie River DevCo LP
Debt Instrument [Line Items]
Controlling interest						100.00%
Blanco River DevCo LP
Debt Instrument [Line Items]
Interest in partnership			15.00%
Controlling interest		40.00%				40.00%
Noncontrolling interest						60.00%
Gunnison River DevCo LP
Debt Instrument [Line Items]
Controlling interest						5.00%
Noncontrolling interest						95.00%
Trinity River DevCo LLC
Debt Instrument [Line Items]
Controlling interest						100.00%
White Cliffs Pipeline
Debt Instrument [Line Items]
Non-controlling ownership					3.33%	3.33%
IPO \| Common Units
Debt Instrument [Line Items]
Sold (in units) \| shares					14,375,000
Price ($ per unit) \| $ / shares					$ 22.50
Price, net ($ per unit) \| $ / shares					$ 21.20625
Over-Allotment Option \| Common Units
Debt Instrument [Line Items]
Sold (in units) \| shares	480,000				1,875,000
Private Placement
Debt Instrument [Line Items]
Sold (in units) \| shares			3,525,000
Payments of stock issuance costs			$ 4.6
Advantage Pipeline \| Corporate Joint Venture
Debt Instrument [Line Items]
Consideration transferred				$ 133.0
Payments to acquire business				$ 66.8
Length (miles) \| mi				70
Shipping capacity per day (bbls/day) \| bbl / d				150
Storage capacity (bbls) \| bbl				490
Advantage Pipeline \| Plains All American Pipeline \| Corporate Joint Venture
Debt Instrument [Line Items]
Interest acquired						50.00%
Blanco River and Colorado River DevCos
Debt Instrument [Line Items]
Consideration transferred			270.0
Payments to acquire businesses			$ 245.0
Equity interest issued (shares) \| shares			562,430
Share price ($ per unit) \| $ / shares			$ 44.45
Saddle Butte
Debt Instrument [Line Items]
Length (miles) \| mi						160
Delivery capacity (Mbbl/day) \| MMBTU						300
Saddle Butte
Debt Instrument [Line Items]
Dedicated acres \| a						141
Number of customers under fixed fee arrangements on dedicated acreage \| customer						6