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Equity-Indexed Compensation Plans - AAP Management Units (Details) - AAP Management Units
Dec. 31, 2017
shares
Equity-Indexed Compensation Plans  
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 0
Unearned units 800,000
Conversion Of AAP Management Units Into AAP Units  
Equity-Indexed Compensation Plans  
Unit conversion ratio 0.941
AAP  
Equity-Indexed Compensation Plans  
Equivalent distribution entitled to be received when earned (as a percent) 94.10%
AAP  
Equity-Indexed Compensation Plans  
Common units to be issued 0.941