Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Unvested Shares (Details)

v3.21.2
Equity - Summary of Unvested Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Restricted Shares of Common Stock    
Shares    
Beginning Balance (in shares) 367,177 750,242
Granted (in shares) 80,886 194,077
Vested (in shares) (250,758) (576,880)
Forfeited (in shares) (50) (262)
Ending Balance (in shares) 197,255 367,177
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 27.77 $ 20.08
Granted (in usd per share) 59.41 32.93
Vested (in usd per share) 29.22 19.50
Forfeited (in usd per share) 63.59 28.59
Ending Balance (in usd per share) $ 38.89 $ 27.77
Value    
Beginning Balance $ 10.2 $ 15.1
Granted 4.8 6.4
Vested (7.3) (11.3)
Forfeited 0.0 0.0
Ending Balance $ 7.7 $ 10.2
Restricted stock units    
Shares    
Beginning Balance (in shares) 235,600 435,578
Granted (in shares) 17,426 23,342
Vested (in shares) (342,360) (439,986)
Forfeited (in shares) 0 (266)
Ending Balance (in shares) 81,846 235,600
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 21.78 $ 20.12
Granted (in usd per share) 71.23 27.18
Vested (in usd per share) 20.24 19.04
Forfeited (in usd per share) 0 25.90
Ending Balance (in usd per share) $ 35.52 $ 21.78
Value    
Beginning Balance $ 5.1 $ 8.8
Granted 1.2 0.6
Vested (6.9) (8.4)
Forfeited 0.0 0.0
Ending Balance $ 2.9 $ 5.1
Restricted stock units | Minimum    
Value    
Vesting percentage 0.00%  
Restricted stock units | Maximum    
Value    
Vesting percentage 200.00%  
Incremental performance shares granted    
Shares    
Granted (in shares) 171,180 216,932
Weighted Average Grant Date Fair Value    
Granted (in usd per share) $ 20.24 $ 18.99
Value    
Granted $ 3.5 $ 4.1
LTIP time-based vesting units    
Shares    
Beginning Balance (in shares) 285,682 201,310
Granted (in shares) 249,573 165,346
Vested (in shares) (151,209) (80,974)
Forfeited (in shares) 0 0
Ending Balance (in shares) 384,046 285,682
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 21.62 $ 25.84
Granted (in usd per share) 54.73 18.56
Vested (in usd per share) 21.58 25.87
Forfeited (in usd per share) 0 0
Ending Balance (in usd per share) $ 43.15 $ 21.62
Value    
Beginning Balance $ 6.2 $ 5.2
Granted 13.7 3.1
Vested (3.3) (2.1)
Forfeited 0.0 0.0
Ending Balance $ 16.6 $ 6.2
LTIP market-based vesting units    
Shares    
Beginning Balance (in shares) 312,704 180,500
Granted (in shares) 86,274 132,204
Vested (in shares) (103,000) 0
Forfeited (in shares) 0 0
Ending Balance (in shares) 347,478 312,704
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 20.59 $ 26.70
Granted (in usd per share) 65.28 12.25
Vested (in usd per share) 21.09 0
Forfeited (in usd per share) 0 0
Ending Balance (in usd per share) $ 31.61 $ 20.59
Value    
Beginning Balance $ 6.4 $ 4.8
Granted 5.6 1.6
Vested (2.1) 0.0
Forfeited 0.0 0.0
Ending Balance $ 11.0 $ 6.4
LTIP market-based vesting units | Minimum    
Value    
Vesting percentage 0.00%  
LTIP market-based vesting units | Maximum    
Value    
Vesting percentage 200.00%  
Incremental performance shares granted    
Shares    
Granted (in shares) 51,500  
Weighted Average Grant Date Fair Value    
Granted (in usd per share) $ 21.09  
Value    
Granted $ 1.1