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Business Segments, Gross Operating Margin (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Segments [Abstract]                      
Operating income $ 1,418.0 $ 1,474.2 $ 1,560.3 $ 1,626.2 $ 1,640.4 $ 1,643.3 $ 986.4 $ 1,138.5 $ 6,078.7 $ 5,408.6 $ 3,928.9
Adjustments to reconcile operating income to total gross operating margin (addition or subtraction indicated by sign):                      
Depreciation, amortization and accretion expense in operating costs and expenses                 1,848.3 1,687.0 1,531.3
Asset impairment and related charges in operating costs and expenses                 132.7 50.5 49.8
Net gains attributable to asset sales in operating costs and expenses                 (5.7) (28.7) (10.7)
General and administrative costs                 211.7 208.3 181.1
Non-refundable payments received from shippers attributable to make-up rights [1]                 47.0 21.5 24.1
Subsequent recognition of revenues attributable to make-up rights [2]                 (22.9) (56.2) (29.9)
Total segment gross operating margin                 $ 8,289.8 $ 7,291.0 $ 5,674.6
[1] Since make-up rights entail a future performance obligation by the pipeline to the shipper, these receipts are recorded as deferred revenue for GAAP purposes; however, these receipts are included in gross operating margin in the period of receipt since they are nonrefundable to the shipper.
[2] As deferred revenues attributable to make-up rights are subsequently recognized as revenue under GAAP, gross operating margin must be adjusted to remove such amounts to prevent duplication since the associated non-refundable payments were previously included in gross operating margin.