Earnings Per Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
BASIC EARNINGS PER UNIT
Net income attributable to limited partners		$ 1,350.1	$ 1,260.5
Earnings allocated to phantom unit awards	[1]	(9.9)	(7.8)
Net income available to common unitholders		$ 1,340.2	$ 1,252.7
Basic weighted-average number of common units outstanding (in units)		2,188.9	2,187.1
Basic earnings per unit (in dollars per unit)		$ 0.61	$ 0.57
DILUTED EARNINGS PER UNIT
Net income attributable to limited partners		$ 1,350.1	$ 1,260.5
Diluted weighted-average number of units outstanding:
Distribution-bearing common units (in units)		2,188.9	2,187.1
Phantom units (in units)	[1]	15.1	12.4
Total (in units)		2,204.0	2,199.5
Diluted earnings per unit (in dollars per unit)		$ 0.61	$ 0.57

[1] Phantom units are considered participating securities for purposes of computing basic earnings per unit. See Note 13 for information regarding our phantom units.