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Equity-Based Awards - Unit Activities (Details)
12 Months Ended
Dec. 31, 2019
$ / shares
shares
RSUs  
Quantity  
Unvested, beginning of year (in shares) | shares 5,612,887
Granted (in shares) | shares 3,426,800
Vested (in shares) | shares (1,948,707)
Cancelled (in shares) | shares (725,400)
Unvested at end of year (in shares) | shares 6,365,580
Weighted-Average Grant Date Fair Value  
Unvested, beginning of year (in dollars per share) | $ / shares $ 23.11
Granted (in dollars per share) | $ / shares 21.49
Vested (in dollars per share) | $ / shares 24.06
Cancelled (in dollars per share) | $ / shares 21.76
Unvested at end of year (in dollars per share) | $ / shares $ 22.06
Performance-based RSUs  
Quantity  
Unvested, beginning of year (in shares) | shares 1,718,770
Granted (in shares) | shares 1,210,331
Vested (in shares) | shares (508,168)
Cancelled (in shares) | shares (331,428)
Unvested at end of year (in shares) | shares 2,089,505
Weighted-Average Grant Date Fair Value  
Unvested, beginning of year (in dollars per share) | $ / shares $ 22.60
Granted (in dollars per share) | $ / shares 21.36
Vested (in dollars per share) | $ / shares 22.69
Cancelled (in dollars per share) | $ / shares 22.25
Unvested at end of year (in dollars per share) | $ / shares $ 21.99