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Estimated Cost to Build

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Gas Production Capacity

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Miles of Pipeline

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Percentage of Available Cash Distributed

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The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.

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

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The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities.

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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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This item represents disclosure of the amount of dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporation; these investments are accounted for under the equity method of accounting. This element excludes distributions that constitute a return of investment, which are classified as investing activities.

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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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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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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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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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Cash dividends or other distributions received from unconsolidated subsidiaries, certain corporate joint ventures, and certain noncontrolled corporations that are returns of capital. Excludes dividends or distributions from equity method investments classified as operating activities.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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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 (Details) $ in Millions	1 Months Ended			12 Months Ended
	Feb. 28, 2017 USD ($)	Jan. 31, 2017 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($) miles MMcf	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates in period				$ 12.4	$ 42.0	$ 108.6
Investments in unconsolidated affiliates				1,115.4	254.3
Earnings (loss) from unconsolidated affiliates, net				31.5	(60.8)	(0.7)
Proceeds from sale of assets				972.7	2.7	69.1
Loss on long-lived assets, net				(65.6)	(821.2)	(1.9)
Estimated Cost to Build				180.0
Related Party Transaction, Expenses from Transactions with Related Party				7.7	2.8	0.2
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital				14.8	9.3	0.0
Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates				197.2	202.4
Earnings (loss) from unconsolidated affiliates, net				20.8	(43.4)	0.5
Difference between carrying amount and underlying equity				$ 0.8
Equity method ownership percentage				50.00%
Proceeds from Equity Method Investment, Dividends or Distributions				$ 27.4	12.5
Jackalope Gas Gathering Services, LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions	$ 5.9
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates in period			$ 132.8
Investments in unconsolidated affiliates				39.0	36.8
Deconsolidation, Gain (Loss), Amount			30.6
Earnings (loss) from unconsolidated affiliates, net				(0.3)	2.5	0.2
Difference between carrying amount and underlying equity				$ 27.8
Amortization					1.3
Equity method ownership percentage				50.01%
Proceeds from Equity Method Investment, Dividends or Distributions				$ 8.5	7.4
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates in period					10.7	3.4
Investments in unconsolidated affiliates				8.7	15.1
Earnings (loss) from unconsolidated affiliates, net				(4.4)	(19.9)	(1.4)
Difference between carrying amount and underlying equity				15.3
Amortization				$ 1.6
Equity method ownership percentage				50.01%
Proceeds from Equity Method Investment, Dividends or Distributions				$ 2.0	1.9
Powder River Basin Industrial Complex, LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions		$ 0.4
Crestwood Permian Basin Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Gas Production Capacity \| MMcf				250
Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Available Cash Distributed				35.00%
Investments in unconsolidated affiliates				$ 871.0	0.0
Earnings (loss) from unconsolidated affiliates, net				15.9	0.0	0.0
Difference between carrying amount and underlying equity				$ 51.4
Equity method ownership percentage				50.00%
Related Party Transaction, Expenses from Transactions with Related Party				$ 5.0
Proceeds from Equity Method Investment, Dividends or Distributions				16.0
Stagecoach Gas Services LLC \| Subsequent Event
Schedule of Equity Method Investments [Line Items]
Proceeds from Equity Method Investment, Dividends or Distributions		$ 12.1
RKI Exploration and Production, LLC's \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Amortization				0.1	3.0	3.1
Crestwood Niobrara LLC \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates in period				1.4	25.4	105.2
Crestwood Niobrara LLC \| Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates in period				$ 11.0	5.7
Crestwood Equity Partners LP \| Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates					35.8
Crestwood Equity Partners LP \| Crestwood Permian Basin Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage				50.00%
Capital Commitment to Acquire Equity Method Investment				$ 37.5
Crestwood Equity Partners LP \| Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates				$ 871.1
SWEPI LP \| Crestwood Permian Basin Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage				50.00%
Twin Eagle Powder River Basin, LLC \| Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Percentage of voting interests acquired				50.00%
First Reserve Management, L.P. \| Crestwood Permian Basin Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Capital Commitment to Acquire Equity Method Investment				$ 37.5
CEGP [Member] \| Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Percentage of Available Cash Distributed				65.00%
Proceeds from sale of assets				$ 975.0
Tres Palacios Storage Company LLC
Schedule of Equity Method Investments [Line Items]
Related Party Transaction, Expenses from Transactions with Related Party				2.7	2.8	0.2
CMLP
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates in period				12.4	41.8	144.4
Investments in unconsolidated affiliates				1,115.4	254.3
Earnings (loss) from unconsolidated affiliates, net				31.5	(60.8)	(0.7)
Proceeds from sale of assets				972.7	2.7	2.7
Loss on long-lived assets, net				(65.6)	(227.8)	(35.1)
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital				$ 14.8	$ 9.3	$ 0.0
CMLP \| Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated affiliates in period			$ 66.4
Equity method ownership percentage				50.01%
CMLP \| Stagecoach Gas Services LLC
Schedule of Equity Method Investments [Line Items]
Deconsolidation, Gain (Loss), Amount				$ 32.4
Equity method ownership percentage				50.00%
Williams Partners LP \| Jackalope Gas Gathering Services, LLC
Schedule of Equity Method Investments [Line Items]
Percentage of voting interests acquired				50.00%
Brookfield Infrastructure Group \| Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Equity method ownership percentage				49.99%
Low Pressure Gathering Lines \| Crestwood Permian Basin Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Miles of pipeline \| miles				194
High Pressure Trunklines \| Crestwood Permian Basin Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Miles of pipeline \| miles				36