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Stock-Based Compensation - Narrative (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Feb. 28, 2021 USD ($) performance_criteria shares | Dec. 31, 2020 USD ($) Award_Type shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | $ 43,200,000 | $ 30,800,000 | $ 33,100,000
Tax benefit for share-based compensation expense |  | 10,000,000.0 | 7,000,000.0 | 7,600,000
Defined contribution cost recognized |  | $ 600,000 |  |
Deferred Compensation, Share-based Payments |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Common shares held in employee trust earned but not distributed (in shares) | shares |  | 495,774 |  |
Restricted Stock Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | $ 400,000 | 1,300,000 | 2,800,000
Award vesting period |  | 3 years |  |
Compensation cost not yet recognized |  | $ 700,000 |  |
Period of recognition for unrecognized compensation costs |  | 1 year 4 months 24 days |  |
Fair value of award |  | $ 200,000 | 4,100,000 | 200,000
Aggregate intrinsic value |  | $ 800,000 |  |
Weighted-average remaining contractual term of non-vested shares |  | 1 year 4 months 24 days |  |
Restricted Stock Awards | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected forfeiture rate |  | 5.00% |  |
Restricted Stock Awards | Graduated or Graded Vesting | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
Restricted Stock Awards | Graduated or Graded Vesting | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 4 years |  |
Restricted Stock Units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | $ 2,100,000 | 2,100,000 | 1,900,000
Aggregate intrinsic value |  | 11,500,000 |  |
Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Share-based compensation expense |  | $ 39,600,000 | $ 28,800,000 | $ 30,600,000
Award vesting period |  | 3 years |  |
Compensation cost not yet recognized |  | $ 28,000,000.0 |  |
Period of recognition for unrecognized compensation costs |  | 2 years 2 months 12 days |  |
Number of performance award types | Award_Type |  | 3 |  |
Aggregate intrinsic value |  | $ 63,700,000 |  |
Weighted-average remaining contractual term of non-vested shares |  | 1 year 4 months 24 days |  |
Number of performance awards where the performance period has ended | Award_Type |  | 2 |  |
Performance Shares | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected forfeiture rate |  | 0.00% |  |
Performance Shares | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected forfeiture rate |  | 7.00% |  |
Internal Metrics Performance Share Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of performance award types | Award_Type |  | 2 |  |
Rights to share portion of award, maximum percent |  | 100.00% |  |
Market Based Performance Share Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of performance award types | Award_Type |  | 1 |  |
Rights to share portion of award, maximum percent |  | 100.00% |  |
Rights to cash portion of award, maximum percent |  | 100.00% |  |
Employee Performance Share Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
Minimum operating cash flow for performance based award |  | $ 100,000,000 |  |
Employee Performance Share Awards | Subsequent Event |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of performance criteria | performance_criteria | 3 |  |  |
Number of performance awards issued and certified (in shares) | shares | 481,784 |  |  |
Grant date fair value of performance shares issued and certified | $ 11,200,000 |  |  |
Employee Performance Share Awards | 50% Vesting on Third Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Rights to share portion of award, maximum percent |  | 100.00% | 33.00% | 33.00%
Hybrid Performance Shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Minimum operating cash flow for performance based award |  | $ 100,000,000 |  |
Hybrid Performance Shares | Graduated or Graded Vesting |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
Hybrid Performance Shares | 25% Vesting on First and Second Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  | 25.00% |  |
Hybrid Performance Shares | 50% Vesting on Third Anniversary |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting percentage |  | 50.00% |  |
TSR Performance Share Awards |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance period of peer group |  | 3 years |  |
Cash payments for share-based compensation |  | $ 14,000,000.0 | $ 5,000,000.0 | $ 3,300,000
Number of performance awards issued and certified (in shares) | shares |  | 482,581 |  |
Grant date fair value of performance shares issued and certified |  | $ 9,600,000 |  |
Payments for stock-based compensation |  | 7,900,000 |  |
TSR Performance Share Awards | Liability |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Current portion of share-based liability |  | 0 | 6,100,000 |
Noncurrent portion of share-based liability |  | $ 6,800,000 | $ 4,100,000 |

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