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Partners' Capital and Distributions - Shares and Exchange and Redemption Rights (Details)
 12 Months Ended
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Class A Shares      
Increase (Decrease) in Partners' Capital      
Balance, beginning of period (in shares) 182,138,592 159,485,588 156,111,139
Exchange Right exercises (in shares) 11,858,457 22,637,818 3,363,199
Other (in shares) 54,387 15,186 11,250
Balance, end of period (in shares) 194,051,436 182,138,592 159,485,588
Class B Shares      
Increase (Decrease) in Partners' Capital      
Balance, beginning of period (in shares) 65,785,702 119,604,338 126,984,572
Conversion of AAP Management Units (in shares) 595,117    
Exchange Right exercises (in shares) (11,858,457) (22,637,818) (3,363,199)
Redemption Right exercises (in shares) (3,882,170) (31,180,818) (4,017,035)
Balance, end of period (in shares) 50,640,192 65,785,702 119,604,338
Class C Shares      
Increase (Decrease) in Partners' Capital      
Balance, beginning of period (in shares) 549,538,139 516,938,280 510,925,432
Redemption Right exercises (in shares) 3,882,170 31,180,818 4,017,035
Issuances of Series A preferred units by a subsidiary (in shares)     1,393,926
Repurchase of common units by a subsidiary (in shares) (6,222,748)    
Other (in shares) 520,201 1,419,041 601,887
Balance, end of period (in shares) 547,717,762 549,538,139 516,938,280
AAP | Exchange Of AAP Units And Class B Shares For Class A Shares      
Partners Capital and Distribution [Line Items]      
Ratio for conversion or exchange of units 1    
AAP | Conversion of AAP Management Units into AAP Units      
Partners Capital and Distribution [Line Items]      
Ratio for conversion or exchange of units 0.941