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Equity Incentive Plan (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Equity Incentive Plan              
Maximum number of common shares available for issuance (in shares)   6,828,527   6,828,527      
Restricted share awards              
Summary of non-vested shares/units              
Unvested at the beginning of the period (in shares)       2,380,283      
Granted (in shares)       569,600      
Vested (in shares)       (619,285)      
Forfeited (in shares)       (6,065)      
Unvested at the end of the period (in shares)   2,324,533   2,324,533      
Weighted Average Grant Date Fair Value              
Unvested at the beginning of the period (in dollars per share)       $ 15.43      
Granted (in dollars per share)       15.10      
Vested (in dollars per share)       15.69      
Forfeited (in dollars per share)       13.56      
Unvested at the end of the period (in dollars per share)   $ 15.28   $ 15.28      
Other Disclosures              
Share-based compensation expense   $ 3.6 $ 3.0 $ 7.1 $ 4.9    
Total unrecognized compensation costs   $ 27.8   $ 27.8      
Weighted-average period of recognition of unrecognized share-based compensation expense       2 years      
Total fair value of shares vested       $ 8.7 6.3    
2015 Share Repurchase Program [Member]              
Other Disclosures              
Performance-based vesting period       3 years      
Time-based vesting period       1 year      
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period       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%      
Vesting percentage upon satisfaction of performance-based vesting period       50.00%      
Vesting percentage upon satisfaction of time-based vesting period       50.00%      
Percentage of grant date fair value to be recognized over three years       50.00%      
Employee service share based compensation cost period of recognition       3 years      
Percentage of grant date fair value to be recognized over four years       50.00%      
Employee service share based compensation cost period of recognition       4 years      
2019 Performance Shares [Member]              
Summary of non-vested shares/units              
Granted (in shares) 133,000         260,000  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share           $ 19.16  
Unvested at the end of the period (in shares)   67,000   67,000      
Other Disclosures              
Total fair value of shares vested       $ 0.8      
Fair value assumptions, risk free interest rate           2.52%  
Fair value assumptions, expected volatility rate           27.19%  
Performance Units              
Other Disclosures              
Share-based compensation expense   $ 1.9 $ 1.8 3.5 $ 2.7    
Total unrecognized compensation costs   $ 14.5   $ 14.5      
Weighted-average period of recognition of unrecognized share-based compensation expense       2 years 1 month 6 days      
Performance-based vesting period       4 years      
2020 Performance Shares [Member]              
Summary of non-vested shares/units              
Granted (in shares)         489,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share         $ 11.59    
Other Disclosures              
Fair value assumptions, risk free interest rate         1.08%    
Fair value assumptions, expected volatility rate         23.46%    
2021 Performance Shares              
Summary of non-vested shares/units              
Granted (in shares)       431,151      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share       $ 20.90      
Other Disclosures              
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Absolute Total Shareholder Return       2500.00%      
Share-Based Compensation Arrangement by Share-Based Payment Award, Contingent on Relative Total Shareholder Return       75.00%      
Fair value assumptions, risk free interest rate       0.23%      
Fair value assumptions, expected volatility rate       69.47%      
Percentage of grant date fair value to be recognized over three years       100.00%      
Employee service share based compensation cost period of recognition       3 years      
2022 Performance Shares              
Summary of non-vested shares/units              
Granted (in shares)         407,024    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Intrinsic Value, Amount Per Share       $ 21.96      
Other Disclosures              
Fair value assumptions, risk free interest rate       1.70%      
Fair value assumptions, expected volatility rate       70.15%      
2021 Share Repurchase Program              
Other Disclosures              
Common shares available for future grant (in shares)   3,531,171   3,531,171      
Minimum | 2015 Share Repurchase Program [Member]              
Other Disclosures              
Percentage of performance units that will convert into restricted shares       0.00%      
Minimum | 2019 Performance Shares [Member]              
Equity Incentive Plan              
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range             0.00%
Minimum | 2020 Performance Shares [Member]              
Equity Incentive Plan              
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range           0.00%  
Minimum | 2021 Performance Shares              
Equity Incentive Plan              
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range         0.00%    
Minimum | 2022 Performance Shares              
Equity Incentive Plan              
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range       0.00%      
Maximum | 2015 Share Repurchase Program [Member]              
Other Disclosures              
Percentage of performance units that will convert into restricted shares       200.00%      
Maximum | 2019 Performance Shares [Member]              
Equity Incentive Plan              
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range             200.00%
Maximum | 2020 Performance Shares [Member]              
Equity Incentive Plan              
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range           200.00%  
Maximum | 2021 Performance Shares              
Equity Incentive Plan              
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range         200.00%    
Maximum | 2022 Performance Shares              
Equity Incentive Plan              
Shared-Based Compensation Arrangement by Share-Based Payment Award, Conversion Percentage Range       200.00%