Equity and Distributions, Noncontrolling Interests (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Noncontrolling Interest [Roll Forward]
Noncontrolling interest balance at beginning of period			$ 438.7
Net income attributable to noncontrolling interests	$ 25.6	$ 21.4	67.3	$ 45.6
Cash distributions paid to noncontrolling interests	(22.8)	(22.6)	(69.7)	(50.9)
Cash contributions from noncontrolling interests	491.2	$ 15.1	590.8	$ 222.0
Other			2.4
Noncontrolling interest balance at end of period	$ 1,029.5		$ 1,029.5
Pascagoula Natural Gas Processing Facility [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	25.00%		25.00%
Noncontrolling Interest, Increase from Sale of Parent Equity Interest			$ 36.0
Shin Oak NGL Pipeline [Member]
Noncontrolling Interest
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	33.00%		33.00%
Noncontrolling Interest, Increase from Sale of Parent Equity Interest			$ 440.7

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which is directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent (that is, noncontrolling interest, previously referred to as minority interest).

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