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Equity Incentive Plan - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
May 31, 2016
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares authorized (in shares)       6,828,527      
Common shares available for future grant (in shares)       4,130,607      
Restricted share awards              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Unvested restricted shares       2,380,283 1,252,228 940,202 740,792
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value       $ 15.43 $ 15.17 $ 20.21 $ 21.89
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       1,739,327 801,463 530,436  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 15.92 $ 11.95 $ 18.69  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period       (513,342) (480,444) (312,131)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value       $ 16.51 $ 19.59 $ 21.63  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period       (97,930) (8,993) (18,895)  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value       $ 15.22 $ 18.80 $ 20.03  
Share-based compensation expense       $ 11.9 $ 8.7 $ 8.6  
Total unrecognized compensation costs       $ 27.1      
Weighted-average period of recognition of unrecognized share-based compensation expense       2 years 2 months 12 days      
Total fair value of shares vested       $ 7.8 5.2 5.5  
2018 Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period             264,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value             $ 13.99
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate             2.42%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate             27.44%
Performance units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation expense       5.2 $ 3.5 $ 2.9  
Total unrecognized compensation costs       $ 9.3      
Weighted-average period of recognition of unrecognized share-based compensation expense       1 year 10 months 24 days      
2019 Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period           260,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value           $ 19.16  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate           2.52%  
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate           27.19%  
2015 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period   4 years          
Share Based Compensation Arrangement by Share Based Payment Award, Performance Based Vesting Period 3 years            
Share Based Compensation Arrangement by Share Based Payment Award, Time Based Vesting Period 1 year   1 year        
Share-based compensation arrangement, by share based payment award, vesting rights percentage immediately 50.00%            
Share-based compensation arrangement, by share-based payment award vesting rights, percentage after one year 50.00%            
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Percentage Of Grant Date Fair Value Recognized Over Three Years 50.00%            
Employee Service Share Based Compensation Nonvested Awards For First Fifty Percent Compensation Cost Not Yet Recognized Period For Recognition 3 years            
Employee Service Share Based Compensation Nonvested Awards For Remaining Fifty Percent Compensation Cost Not Yet Recognized Period For Recognition 50.00%            
Employee Service Share Based Compensation Nonvested Awards For Remaining Fifty Percent Cost Not Yet Recognized, Period For Recognition 4 years            
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Absolute Total Shareholder Return       40.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Relative Total Shareholder Return       60.00%      
2021 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based compensation arrangement, by share based payment award, vesting rights percentage immediately 100.00%            
Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Share Based Awards Other Than Options Percentage Of Grant Date Fair Value Recognized Over Three Years       100.00%      
Employee Service Share Based Compensation Nonvested Awards For First Fifty Percent Compensation Cost Not Yet Recognized Period For Recognition       3 years      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Absolute Total Shareholder Return       25.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Relative Total Shareholder Return       75.00%      
2020 Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period         489,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value         $ 11.59    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate         1.08%    
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate         23.46%    
2021 Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       431,151      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value       $ 20.90      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate       0.23%      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate       69.47%      
Minimum | 2016 Performance Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period     25        
Minimum | 2017 Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period           25  
Minimum | 2018 Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period         25    
Minimum | 2019 Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period       25      
Minimum | 2015 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period 0.00%            
Minimum | 2021 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period 0.00%            
Maximum | 2016 Performance Units              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period     150        
Maximum | 2017 Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period           150  
Maximum | 2018 Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period         150    
Maximum | 2019 Performance Shares [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period       200      
Maximum | 2015 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period 200.00%            
Maximum | 2021 Equity Incentive Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shared-based compensation arrangement by share based payment award, conversion percentage of units granted in period 200.00%