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Partners' Capital and Distributions - Exchange Rights and Shares Activity (Details) - shares
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Class A Shares    
Activity for Class A shares and Class B shares    
Balance, beginning of period (shares) 101,206,526 86,099,037
Exchange Right exercises (shares) 2,172,236 14,169,317
Sales of Class A shares (shares) 50,086,326  
Other (shares) 7,810  
Issuance of Class A shares under LTIP (shares)   7,811
Balance, end of period (shares) 153,472,898 100,276,165
Class B Shares    
Activity for Class A shares and Class B shares    
Balance, beginning of period (shares) 138,043,486 141,485,588
Conversion of AAP Management Units (shares) 1,557,860 6,742,383
Exchange Right exercises (shares) (2,172,236) (14,169,317)
Redemption Right exercises (shares) (3,486,333)  
Balance, end of period (shares) 133,942,777 134,058,654
Class C Shares    
Activity for Class A shares and Class B shares    
Balance, beginning of period (shares) 491,910,863  
Redemption Right exercises (shares) 3,486,333  
Sales of common units by a subsidiary (shares) 4,033,567  
Issuance of common units by a subsidiary for acquisition of interest in Advantage Joint Venture (Note 6) (shares) 1,252,269  
Issuance of Series A preferred units by a subsidiary (shares) 2,601,300  
Other (shares) 122,344  
Balance, end of period (shares) 503,406,676