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- Definition

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

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- Definition

Difference between amount at which an investment accounted for under the equity method of accounting is carried (reported) on the balance sheet and amount of underlying equity in net assets the reporting Entity has in the investee.

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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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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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- Definition

Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Investments in Unconsolidated Affiliates (Net Investments In and Earnings (Loss) from Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jan. 01, 2020	Dec. 31, 2019	Apr. 30, 2019	Apr. 09, 2019
Schedule of Equity Method Investments [Line Items]
Investment	$ 953.0			$ 953.0			$ 980.4
Earnings from unconsolidated affiliates, net	10.5		$ 10.4	24.4	$ 21.0
Crestwood Niobrara LLC
Schedule of Equity Method Investments [Line Items]
Percentage of voting rights acquired									100.00%
Crestwood Niobrara LLC \| Williams Partners LP
Schedule of Equity Method Investments [Line Items]
Additional voting rights acquired									50.00%
Percentage of voting rights acquired									100.00%
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Investment	798.2			798.2			814.4
Earnings from unconsolidated affiliates, net	9.9		10.5	28.3	23.9
Difference between carrying amount and underlying equity	$ 51.3			$ 51.3
Crestwood Permian Basin Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	50.00%			50.00%		50.00%
Investment	$ 113.4			$ 113.4			121.8
Earnings from unconsolidated affiliates, net	0.5		(0.5)	0.3	(7.2)
Difference between carrying amount and underlying equity	9.3			9.3
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investment	37.7			37.7			35.9
Earnings from unconsolidated affiliates, net	0.1		0.5	0.2	0.8
Difference between carrying amount and underlying equity	23.1			23.1
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Investment	3.7			3.7			8.3
Earnings from unconsolidated affiliates, net	0.0	$ (4.5)	$ (0.1)	(4.4)	$ (0.2)
Difference between carrying amount and underlying equity		$ 5.5
Jackalope Gas Gathering Services, L.L.C.
Schedule of Equity Method Investments [Line Items]
Ownership percentage			50.00%		50.00%			50.00%
Investment	0.0			0.0			$ 0.0
Earnings from unconsolidated affiliates, net	$ 0.0		$ 0.0	$ 0.0	$ 3.7