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Employee Benefit Plans - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jan. 04, 2021 item | Jan. 31, 2021 USD ($) shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($)
2005 Incentive Plan |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for issuance (in shares) | shares |  |  | 5,900,000 |  | 5,900,000 |  |
Restricted Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Stock awards granted (in shares) | shares |  |  |  |  | 0 |  |
Compensation cost | $ |  |  | $ 0.8 | $ 1.1 | $ 2.5 | $ 3.2 |
Performance Share Units |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Number of components of equity awards granted | item | 2 |  |  |  |  |  |
Percentage based on service and market conditions | 50.00% |  |  |  |  |  |
Percentage based on service and performance conditions | 50.00% |  |  |  |  |  |
Compensation cost | $ |  |  | 1.0 | 1.0 | 3.1 | 3.0 |
Performance Period |  | 3 years |  |  |  |  |
Share-based payment awards vested (in shares) | shares |  | 368,038 |  |  |  |  |
Award vesting percentage |  | 200.00% |  |  |  |  |
Performance Share Units | Common Stock |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Share-based payment awards vested (in shares) | shares |  | 736,075 |  |  |  |  |
Fair value of awards vested | $ |  | $ 3.1 |  |  |  |  |
Performance Share Units | Maximum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage | 200.00% |  |  |  |  |  |
Performance Share Units | Minimum |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Award vesting percentage | 0.00% |  |  |  |  |  |
RSUs |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Compensation cost | $ |  |  |  |  | 0.4 |  |
Fixed Value Cash Awards |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Long-term incentive cash awards granted | $ |  |  | 3.5 |  | $ 3.5 |  | $ 4.7
Vesting period |  |  |  |  | 3 years |  |
Deferred compensation cost | $ |  |  | $ 1.0 | $ 1.1 | $ 3.0 | $ 3.4 |
ESPP |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |
Shares available for issuance (in shares) | shares |  |  | 1,600,000 |  | 1,600,000 |  |
Purchase limit per employee (in shares) | shares |  |  |  |  | 260 |  |

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