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The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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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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Amount of currency on hand as well as demand deposits with banks or financial institutions, acquired at the acquisition date. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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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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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Acquisitions and Divestitures (Acquisition) (Details) - USD ($) $ in Millions		1 Months Ended		12 Months Ended
	Apr. 09, 2019	Apr. 30, 2019	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 08, 2019
Business Acquisition [Line Items]
Proceeds from Noncontrolling Interests			$ 175.0	$ 235.0	$ 0.0	$ 175.0
Goodwill				80.3
Investments in unconsolidated affiliates				980.4	1,188.2
Gain on acquisition				209.4	0.0	0.0
Revenues				3,181.9	3,654.1	3,880.9
Net income (loss)				319.9	67.0	(166.6)
Revenues				3,202.6	3,729.5	3,935.4
Net income (loss)				313.5	45.0	(193.0)
Jackalope Gas Gathering Services, LLC
Business Acquisition [Line Items]
Business Acquisition, Transaction Costs				2.8
Cash	$ 22.5
Other current assets	30.9
Property, plant and equipment	532.9
Intangible assets	306.0
Goodwill	80.3
Current liabilities	(30.4)
Other long-term liabilities	(21.5)
Estimated fair value of 100% interest in Jackalope	920.7
Gain on acquisition	209.4			$ 209.4
Total purchase price	$ 484.6
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				17 years
Revenues				$ 70.1
Net income (loss)				20.9
CMLP
Business Acquisition [Line Items]
Proceeds from Noncontrolling Interests				235.0	0.0	175.0
Investments in unconsolidated affiliates				980.4	1,188.2
Gain on acquisition				209.4	0.0	0.0
Revenues				3,181.9	3,654.1	3,880.9
Net income (loss)				310.6	58.6	(175.5)
Revenues				3,202.6	3,729.5	3,935.4
Net income (loss)				$ 304.2	36.6	$ (201.9)
Crestwood Niobrara LLC
Business Acquisition [Line Items]
Proceeds from Noncontrolling Interests		$ 235.0
Crestwood Niobrara LLC \| Williams Partners LP
Business Acquisition [Line Items]
Additional voting interest acquired	50.00%
Business Acquisition, Percentage of Voting Interest After Acquisition	100.00%
Crestwood Niobrara LLC \| Jackalope Gas Gathering Services, LLC
Business Acquisition [Line Items]
Proceeds from Noncontrolling Interests		$ 235.0
Valuation Technique, Discounted Cash Flow
Business Acquisition [Line Items]
Business Combination Discount Rate	12.00%
Jackalope Gas Gathering Services, LLC
Business Acquisition [Line Items]
Equity method ownership percentage	50.00%	50.00%		0.00%			50.00%
Investments in unconsolidated affiliates	$ 226.7			$ 0.0	$ 210.2
Jackalope Gas Gathering Services, LLC \| Jackalope Gas Gathering Services, LLC
Business Acquisition [Line Items]
Investments in unconsolidated affiliates	$ 226.7