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Partners' Capital and Distributions - Activity for Series A and B Preferred Units and Common Units (Details) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Series A Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, beginning of period (in units)	71,090,468
Balance, end of period (in units)	71,090,468	71,090,468
Series B Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, beginning of period (in units)	800,000
Balance, end of period (in units)	800,000	800,000
Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, beginning of period (in units)	726,361,924
Sale of common units (in units)			54,119,893
Balance, end of period (in units)	728,028,576	726,361,924
Limited Partners | Series A Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, beginning of period (in units)	71,090,468	69,696,542	64,388,853
Issuances of Series A preferred units in connection with in-kind distributions (in units)		1,393,926	5,307,689
Balance, end of period (in units)	71,090,468	71,090,468	69,696,542
Limited Partners | Series B Preferred Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, beginning of period (in units)	800,000	800,000
Sale of Series B preferred units (in units)			800,000
Balance, end of period (in units)	800,000	800,000	800,000
Limited Partners | Common Units
Increase (Decrease) in Partners' Capital [Roll Forward]
Balance, beginning of period (in units)	726,361,924	725,189,138	669,194,419
Sale of common units (in units)			54,119,893
Issuance of common units in connection with acquisition of interest in Advantage Joint Venture (Note 7) (in units)			1,252,269
Issuance of common units under equity-indexed compensation plans (in units)	1,666,652	1,172,786	622,557
Balance, end of period (in units)	728,028,576	726,361,924	725,189,138

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Number of units distributed for payment of a unit distribution to unit-holder of limited partnership (LP).

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The number of limited partner units outstanding.

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Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

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The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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