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Stock-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 19, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Stock-based Compensation arrangements |  |  |  |  |  |
Stock based compensation expense |  | $ 8.3 | $ 6.7 | $ 24.6 | $ 21.9 |
Restricted stock units |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Granted (shares) |  |  |  | 124,012 |  |
Granted (dollars per share) |  |  |  | $ 15.75 |  |
Performance share awards | Minimum |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Annual forfeiture rate assumption (as a percent) |  |  |  | 0.00% |  |
Performance share awards | Maximum |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Annual forfeiture rate assumption (as a percent) |  |  |  | 5.00% |  |
Performance share awards based on internal performance metrics |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Right to receive additional shares, maximum |  |  |  | 100.00% |  |
Employee performance share awards |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Granted (shares) |  |  |  | 722,500 |  |
Granted (dollars per share) |  |  |  | $ 15.60 |  |
Minimum operating cash flow for the year preceding the performance period |  |  |  |  |  | $ 100.0
Number of years over which performance criteria is to be met |  |  |  | 3 years |  |
Employee performance share awards | Hybrid performance share awards, percentage vesting on the third anniversary |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Award vesting rights (as a percent) |  | 100.00% |  |  |  |
Hybrid performance share awards |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Granted (shares) |  |  |  | 506,412 |  |
Granted (dollars per share) |  |  |  | $ 15.60 |  |
Minimum operating cash flow for the year preceding the performance period |  |  |  | $ 100.0 |  |
Hybrid performance share awards | Hybrid performance share awards, percentage vesting on the first anniversary |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  | 25.00% |  |
Hybrid performance share awards | Hybrid performance share awards, percentage vesting on the second anniversary |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  | 25.00% |  |
Hybrid performance share awards | Hybrid performance share awards, percentage vesting on the third anniversary |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Award vesting rights (as a percent) |  |  |  | 50.00% |  |
Performance shares based on market conditions |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Right to receive shares |  |  |  | 100.00% |  |
Right to receive an additional award in cash |  |  |  | 100.00% |  |
TSR performance share awards |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Granted (shares) |  |  |  | 862,180 |  |
Granted (dollars per share) | $ 13.79 |  |  |  |  |
Performance period |  |  |  | 3 years |  |
TSR performance share awards | Minimum |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Granted (dollars per share) |  |  |  | $ 12.66 |  |
TSR performance share awards | Maximum |  |  |  |  |  |
Stock-based Compensation arrangements |  |  |  |  |  |
Granted (dollars per share) |  |  |  | $ 15.28 |  |

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- Definition The rate of forfeitures assumptions that is used in calculating the fair values of a share-based compensation award. + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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