Partners' Capital and Distributions - Exchange Rights and Shares Activity (Details) - shares	9 Months Ended
	Sep. 30, 2017	Sep. 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)	3,231,281	14,665,076
Sales of Class A shares (shares)	50,086,326
Other (shares)	19,060
Issuance of Class A shares under LTIP (shares)		7,811
Balance, end of period (shares)	154,543,193	100,771,924
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	13,567,916
Exchange Right exercises (shares)	(3,231,281)	(14,665,076)
Redemption Right exercises (shares)	(4,959,861)
Balance, end of period (shares)	131,410,204	140,388,428
Class C Shares
Activity for Class A shares and Class B shares
Balance, beginning of period (shares)	491,910,863
Redemption Right exercises (shares)	4,959,861
Sales of common units by a subsidiary (shares)	4,033,567
Issuance of common units by a subsidiary in connection with acquisition of interest in Advantage Joint Venture (Note 6) (shares)	1,252,269
Issuances of Series A preferred units by a subsidiary (shares)	3,941,096
Other (shares)	603,497
Balance, end of period (shares)	506,701,153