With respect to a business combination completed during the period, this element provides a description of the business, other than the name, which may include the industry, size, products and other important information.

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-SubTopic 10
-Section 50
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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
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No definition available.

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In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination.

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- Definition

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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-SubTopic 10
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Amount of investment in equity method investee and investment in and advance to affiliate.

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-Name Accounting Standards Codification
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-SubTopic 10
-Section S99
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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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-SubTopic 10
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Business Combinations (Details) - USD ($) $ in Millions	12 Months Ended
Business Combinations (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Mar. 29, 2018
Business Combination
Investments in unconsolidated affiliates	$ 2,615.1	$ 2,659.4	$ 2,677.3
Gain on step acquisition of Delaware Processing	39.4	0.0	0.0
Cash used for business combinations, net of cash received	$ 150.6	198.7	$ 1,000.0
Delaware Basin Gas Processing LLC [Member]
Business Combination
Business acquisition, description	Delaware Processing owns a cryogenic natural gas processing facility having a capacity of 150 million cubic feet per day (“MMcf/d”). The facility is located in Reeves County, Texas and entered service in August 2016. The acquired business serves growing production of NGL-rich natural gas from the Delaware Basin in West Texas and southern New Mexico.
Remaining membership interest acquired				50.00%
Ownership interest				50.00%
Investments in unconsolidated affiliates				$ 107.0
Gain on step acquisition of Delaware Processing	$ 39.4
Cash used for business combinations, net of cash received	$ 150.6
Azure Midstream Partners, L.P. [Member]
Business Combination
Business acquisition, description	The acquired business assets, which are located primarily in East Texas, include over 750 miles of natural gas gathering pipelines and two natural gas processing facilities (Panola and Fairway) with an aggregate processing capacity of 130 MMcf/d. The acquired business primarily serves production from the Haynesville Shale and Bossier, Cotton Valley and Travis Peak formations.
Cash used for business combinations, net of cash received		$ 191.4