Commitments and Contingencies, Contractual Obligations (Details) bbl in Millions, $ in Millions, BTU in Trillions	12 Months Ended
	Dec. 31, 2017 USD ($) bbl BTU	Dec. 31, 2016 USD ($)
Scheduled maturities of debt obligations [Abstract]
2018	$ 2,855.7
2019	1,500.0
2020	1,500.0
2021	575.0
2022	650.0
Thereafter	17,699.4
Total	24,780.1	$ 23,901.6
Estimated cash interest payments [Abstract]
2018	1,082.9
2019	1,022.1
2020	964.2
2021	912.1
2022	884.7
Thereafter	19,076.0
Total	23,942.0
Operating lease obligations [Abstract]
2018	57.0
2019	52.8
2020	47.2
2021	40.0
2022	31.3
Thereafter	185.0
Total	413.3
Natural Gas [Member]
Estimated payment obligations:
2018	615.1
2019	528.6
2020	434.9
2021	332.9
2022	0.0
Thereafter	0.0
Total	$ 1,911.5
Underlying major volume commitments:
2018 | BTU	265
2019 | BTU	225
2020 | BTU	182
2021 | BTU	140
2022 | BTU	0
Thereafter | BTU	0
Total | BTU	812
NGLs [Member]
Estimated payment obligations:
2018	$ 69.6
2019	29.4
2020	0.0
2021	0.0
2022	0.0
Thereafter	0.0
Total	$ 99.0
Underlying major volume commitments:
2018 | bbl	5
2019 | bbl	2
2020 | bbl	0
2021 | bbl	0
2022 | bbl	0
Thereafter | bbl	0
Total | bbl	7
Crude Oil [Member]
Estimated payment obligations:
2018	$ 1,352.3
2019	1,341.0
2020	945.8
2021	728.4
2022	728.4
Thereafter	2,795.4
Total	$ 7,891.3
Underlying major volume commitments:
2018 | bbl	38
2019 | bbl	55
2020 | bbl	51
2021 | bbl	47
2022 | bbl	47
Thereafter | bbl	233
Total | bbl	471
Petrochemicals And Refined Products [Member]
Estimated payment obligations:
2018	$ 411.9
2019	214.1
2020	6.1
2021	0.0
2022	0.0
Thereafter	0.0
Total	$ 632.1
Underlying major volume commitments:
2018 | bbl	7
2019 | bbl	4
2020 | bbl	0
2021 | bbl	0
2022 | bbl	0
Thereafter | bbl	0
Total | bbl	11
Estimated Payment Obligations Other [Member]
Estimated payment obligations:
2018	$ 9.3
2019	9.3
2020	7.6
2021	3.5
2022	1.4
Thereafter	2.2
Total	33.3
Service Payment Commitments [Member]
Estimated payment obligations:
2018	98.3
2019	84.5
2020	60.0
2021	44.8
2022	43.1
Thereafter	67.3
Total	398.0
Capital Expenditure Commitments [Member]
Estimated payment obligations:
2018	171.6
2019	0.0
2020	0.0
2021	0.0
2022	0.0
Thereafter	0.0
Total	171.6
EFS Midstream Contract with Producers [Member]
Contractual obligation [Line Items]
Contractual obligation	270.0
Capital expenditures to date	$ 151.0
Contract term	10 years