Investments in Unconsolidated Affiliates (Net Investments In and Earnings (Loss) from Unconsolidated Affiliates) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investment	$ 260.6		$ 254.3
Earnings from unconsolidated affiliates, net	6.5	$ 3.4
Jackalope Gas Gathering Services, L.L.C.
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 5.1
Ownership Percentage	50.00%
Investment	$ 202.4		202.4
Earnings from unconsolidated affiliates, net	5.1	2.5
Difference between carrying amount and underlying equity	0.9
Amortization	$ 0.1	0.8
Tres Palacios Holdings LLC
Schedule of Equity Method Investments [Line Items]
Ownership Percentage	50.01%
Investment	$ 43.1		36.8
Earnings from unconsolidated affiliates, net	0.8	0.9
Difference between carrying amount and underlying equity	28.8
Amortization	0.3	0.3
Powder River Basin Industrial Complex, LLC
Schedule of Equity Method Investments [Line Items]
Proceeds from equity method investments	$ 0.6	0.3
Ownership Percentage	50.01%
Investment	$ 15.1		$ 15.1
Earnings from unconsolidated affiliates, net	0.6	$ 0.0
Difference between carrying amount and underlying equity	23.0
Amortization	$ 0.4

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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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.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
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-Section 50
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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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-Publisher FASB
-Name Accounting Standards Codification
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-Publisher FASB
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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