Partners' Capital and Distributions - Exchange Rights and Shares Activity (Details) - shares	3 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019
Class A Shares
Activity for Class A shares, Class B shares and Class C shares
Balance, beginning of period (shares)	184,260,178	184,240,079	182,138,592	166,817,333	159,485,588	159,485,588
Exchange Right exercises (shares)	3,000,000		2,101,487	15,173,490	7,331,745
Other (shares)	26,215	20,099		15,186
Balance, end of period (shares)	187,286,393	184,260,178	184,240,079	182,006,009	166,817,333	159,485,588
Class B Shares
Activity for Class A shares, Class B shares and Class C shares
Balance, beginning of period (shares)	63,032,054	63,037,384	65,785,702	99,987,150	119,512,666	119,604,338
Conversion of AAP Management Units (shares)		35,349	559,768
Exchange Right exercises (shares)	(3,000,000)		(2,101,487)	(15,173,490)	(7,331,745)
Redemption Right exercises (shares)	(2,613,326)	(40,679)	(1,206,599)	(16,254,598)	(12,193,771)	(91,672)
Balance, end of period (shares)	57,418,728	63,032,054	63,037,384	68,559,062	99,987,150	119,512,666
Class C Shares
Activity for Class A shares, Class B shares and Class C shares
Balance, beginning of period (shares)	550,837,140	550,769,169	549,538,139	530,053,993	517,256,766	516,938,280
Redemption Right exercises (shares)	2,613,326	40,679	1,206,599	16,254,598	12,193,771	91,672
Other (shares)	349,978	27,292	24,431	588,771	603,456	226,814
Balance, end of period (shares)	553,800,444	550,837,140	550,769,169	546,897,362	530,053,993	517,256,766