Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Unvested Shares (Details)

v3.19.2
Equity - Summary of Unvested Shares (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Restricted Shares of Common Stock [Member]    
Shares    
Beginning Balance (in shares) 1,386,756 1,399,593
Granted (in shares) 150,494 454,106
Vested (in shares) (759,933) (370,072)
Forfeited (in shares) (4,533) (96,871)
Ending Balance (in shares) 772,784 1,386,756
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 19.00 $ 18.73
Granted (in usd per share) 23.99 19.72
Vested (in usd per share) 18.90 18.88
Forfeited (in usd per share) 21.27 18.92
Ending Balance (in usd per share) $ 20.06 $ 19.00
Value    
Beginning Balance $ 26.4 $ 26.2
Granted 3.6 9.0
Vested (14.4) (7.0)
Forfeited (0.1) (1.8)
Ending Balance $ 15.5 $ 26.4
Restricted Stock Units [Member]    
Shares    
Beginning Balance (in shares) 393,148 255,706
Granted (in shares) 46,586 176,128
Vested (in shares) 0 (20,368)
Forfeited (in shares) (2,776) (18,318)
Ending Balance (in shares) 436,958 393,148
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 19.55 $ 18.99
Granted (in usd per share) 25.10 20.24
Vested (in usd per share) 0 18.99
Forfeited (in usd per share) 22.23 19.05
Ending Balance (in usd per share) $ 20.12 $ 19.55
Value    
Beginning Balance $ 7.7 $ 4.9
Granted 1.2 3.5
Vested 0.0 (0.4)
Forfeited (0.1) (0.3)
Ending Balance $ 8.8 $ 7.7
Restricted Stock Units [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage 0.00%  
Restricted Stock Units [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage 200.00%  
LTIP Time-Based Vesting Units [Member]    
Shares    
Beginning Balance (in shares) 0  
Granted (in shares) 204,560  
Vested (in shares) 0  
Forfeited (in shares) 0  
Ending Balance (in shares) 204,560 0
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 0  
Granted (in usd per share) 25.82  
Vested (in usd per share) 0  
Forfeited (in usd per share) 0  
Ending Balance (in usd per share) $ 25.82 $ 0
Value    
Beginning Balance $ 0.0  
Granted 5.3  
Vested 0.0  
Forfeited 0.0  
Ending Balance $ 5.3 $ 0.0
LTIP Market-Based Vesting Units [Member]    
Shares    
Beginning Balance (in shares) 0  
Granted (in shares) 180,500  
Vested (in shares) 0  
Forfeited (in shares) 0  
Ending Balance (in shares) 180,500 0
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 0  
Granted (in usd per share) 26.70  
Vested (in usd per share) 0  
Forfeited (in usd per share) 0  
Ending Balance (in usd per share) $ 26.70 $ 0
Value    
Beginning Balance $ 0.0  
Granted 4.8  
Vested 0.0  
Forfeited 0.0  
Ending Balance $ 4.8 $ 0.0
LTIP Market-Based Vesting Units [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage 0.00%  
LTIP Market-Based Vesting Units [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage 200.00%