Quarterly report pursuant to Section 13 or 15(d)

Employee Benefits and Compensation Plans - Summary of Restricted Unit Activity (Details 2)

v3.10.0.1
Employee Benefits and Compensation Plans - Summary of Restricted Unit Activity (Details 2) - Restricted share units
6 Months Ended
Jun. 30, 2018
$ / shares
shares
Time-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2018 | shares 2,555,477
Granted | shares 1,613,077
Vested | shares (1,006,184)
Forfeited or expired | shares (81,980)
Non-vested and expected to vest as of June 30, 2018 | shares 3,080,390
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2018 | $ / shares $ 50.86
Granted | $ / shares 56.73
Vested | $ / shares 50.61
Forfeited or expired | $ / shares 53.29
Non-vested and expected to vest as of June 30, 2018 | $ / shares $ 53.96
Performance-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2018 | shares 0
Granted | shares 843,998
Vested | shares 0
Forfeited or expired | shares (12,500)
Non-vested and expected to vest as of June 30, 2018 | shares 831,498
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2018 | $ / shares $ 0
Granted | $ / shares 56.58
Vested | $ / shares 0
Forfeited or expired | $ / shares 59.43
Non-vested and expected to vest as of June 30, 2018 | $ / shares $ 56.58
Market-Based Awards  
Number of Restricted Share Awards  
Non-vested as of January 1, 2018 | shares 50,000
Granted | shares 0
Vested | shares 0
Forfeited or expired | shares 0
Non-vested and expected to vest as of June 30, 2018 | shares 50,000
Weighted- Average Grant-Date Fair Value  
Non-vested as of January 1, 2018 | $ / shares $ 59.43
Granted | $ / shares 0
Vested | $ / shares 0
Forfeited or expired | $ / shares 0
Non-vested and expected to vest as of June 30, 2018 | $ / shares $ 59.43