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Share-Based Compensation - Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2022
Jan. 31, 2021
Mar. 31, 2022
Dec. 31, 2021
Time-Based Restricted Stock Units        
Number of Units        
Beginning balance (in shares) 1,071,959   1,071,959  
Granted (in shares)     350,641  
Market-performance adjustment (in shares)     0  
Vested (in shares)     (171,176)  
Forfeited (in shares)     (45,597)  
Ending balance (in shares)     1,205,827  
Nonvested shares, aggregate intrinsic value     $ 33.6 $ 35.1
Shares vested, but not released (in shares)     615,643  
Shares vested, but not released, aggregate intrinsic value     $ 17.2  
Total outstanding awards (in shares)     1,821,470  
Total outstanding awards, aggregate intrinsic value     $ 50.8  
Performance-Based Restricted Stock Units        
Number of Units        
Beginning balance (in shares) 0   0  
Granted (in shares)     0  
Market-performance adjustment (in shares)     0  
Vested (in shares)     0  
Forfeited (in shares)     0  
Ending balance (in shares)     0  
Nonvested shares, aggregate intrinsic value     $ 0.0 0.0
Shares vested, but not released (in shares)     42,856  
Shares vested, but not released, aggregate intrinsic value     $ 1.2  
Total outstanding awards (in shares)     42,856  
Total outstanding awards, aggregate intrinsic value     $ 1.2  
Market-Based Restricted Stock Units        
Number of Units        
Beginning balance (in shares) 374,048   374,048  
Granted (in shares)     130,458  
Market-performance adjustment (in shares)     (18,253)  
Vested (in shares) (194,111) (799,591) (194,111)  
Forfeited (in shares)     (8,044)  
Ending balance (in shares)     284,098  
Nonvested shares, aggregate intrinsic value     $ 7.9 $ 12.3
Shares vested, but not released (in shares)     0  
Shares vested, but not released, aggregate intrinsic value     $ 0.0  
Total outstanding awards (in shares)     284,098  
Total outstanding awards, aggregate intrinsic value     $ 7.9  
Resigned Trustee | Restricted Stock Units        
Number of Units        
Shares vested, but not released (in shares)     568,753  
Weighted average grant date fair value of vested awards (in USD per share)     $ 9.38  
Trustees | Restricted Stock Units        
Number of Units        
Shares vested, but not released (in shares)       46,890
Weighted average grant date fair value of vested awards (in USD per share)       $ 8.42
Former Chief Executive Officer | Restricted Stock Units        
Number of Units        
Shares vested, but not released (in shares)       42,856
Weighted average grant date fair value of vested awards (in USD per share)       $ 13.43