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Stock-Based Compensation (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023
Share-Based Payment Arrangement, Noncash Expense [Abstract] |  |
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block] |  | A summary of stock-based compensation costs is as follows (in millions):
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Notional stock units and stock appreciation rights | $ | 1.0 |  |  | $ | 0.9 |  |  | $ | 11.6 |
Restricted stock | 0.4 |  |  | 0.2 |  |  | — |
BOD and employee restricted stock units | 0.9 |  |  | 0.7 |  |  | 0.5 |
Stock options | — |  |  | 0.1 |  |  | 0.1 |
Total stock-based compensation costs | $ | 2.3 |  |  | $ | 1.9 |  |  | $ | 12.2 |
Total recognized tax benefit | $ | (0.3) |  |  | $ | (0.2) |  |  | $ | (1.5) |
Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity [Table Text Block] |  | The following table summarizes Centrus’ board restricted stock units activity:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2020 | 47 |  | $10.38
Granted | 20 |  | $25.13
Vested | (47) |  | $10.38
Forfeited | — |  | —
Nonvested at December 31, 2021 | 20 |  | $25.13
Granted | 28 |  | $38.80
Vested | (20) |  | $25.13
Forfeited | — |  | —
Nonvested at December 31, 2022 | 28 |  | $38.80
Granted | 17 |  | $35.95
Vested | (28) |  | $38.80
Forfeited | — |  | —
Nonvested at December 31, 2023 | 17 |  | $35.95
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |  | The following table summarizes Centrus’ employee restricted stock units activity:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2020 | — |  | —
Granted | 4 |  | $24.01
Vested | — |  | —
Forfeited | — |  | —
Nonvested at December 31, 2021 | 4 |  | $24.01
Granted | — |  | —
Vested | (1) |  | $24.01
Forfeited | — |  | —
Nonvested at December 31, 2022 | 3 |  | $24.01
Granted | 20 |  | $55.54
Vested | (1) |  | $24.01
Forfeited | (1) |  | $24.01
Nonvested at December 31, 2023 | 21 |  | $54.04
Share-based Compensation, Stock Options, Activity [Table Text Block] |  | A summary of stock option activity follows:
| Stock Options (in thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2020 | 411 |  | $4.18 |  | 5.3 |  | $7.8
Granted | — |  | — |  | — |  | —
Exercised | (217) |  | $4.17 |  | — |  | —
Forfeited/Cancelled | — |  | — |  | — |  | —
Outstanding at December 31, 2021 | 194 |  | $4.18 |  | 4.4 |  | $8.9
Granted | — |  | — |  | — |  | —
Exercised | (98) |  | $4.00 |  | — |  | —
Forfeited/Cancelled | — |  | — |  | — |  | —
Outstanding at December 31, 2022 | 96 |  | $4.37 |  | 2.2 |  | $2.7
Granted | — |  | — |  | — |  | —
Exercised | — |  | — |  | — |  | —
Forfeited/Cancelled | — |  | — |  | — |  | —
Outstanding at December 31, 2023 | 96 |  | $4.37 |  | 0.3 |  | $4.8
Exercisable at December 31, 2023 | 96 |  | $4.37 |  | 0.3 |  | $4.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block] |  | Stock options outstanding and options exercisable at December 31, 2023, are as follows:
Stock Exercise Price |  | Options Outstanding (thousands) |  | Remaining Contractual Life in Years |  | Options Exercisable (thousands)
$4.37 |  | 96 |  | 0.3 |  | 96
Share-based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] |  | A summary of SARs with time-based vesting granted under the 2014 Plan for the year ended December 31, 2023, are as follows:
| Stock Appreciation Rights (in thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2020 | 84 |  | $5.53 |  | 2.3 |  | $1.5
Granted | — |  | — |  | — |  | —
Exercised | — |  | — |  | — |  | —
Forfeited/Cancelled | — |  | — |  | — |  | —
Outstanding at December 31, 2021 | 84 |  | $5.53 |  | 1.3 |  | $3.7
Granted | — |  | — |  | — |  | —
Exercised | — |  | — |  | — |  | —
Forfeited/Cancelled | (14) |  | $5.53 |  | — |  | —
Outstanding at December 31, 2022 | 70 |  | $5.53 |  | 0.3 |  | $2.7
Granted | — |  | — |  | — |  | —
Exercised | (74) |  | $5.53 |  | — |  | —
Forfeited/Cancelled | 4 |  | $5.53 |  | — |  | —
Outstanding at December 31, 2023 | — |  | — |  | — |  | —
Exercisable at December 31, 2023 | — |  | — |  | — |  | —
Share-based Payment Arrangement, Stock Appreciation Right, Performance Condition, Activity [Table Text Block] | A summary of SARs with performance-based vesting granted under the 2014 Plan in the year ended December 31, 2023, are as follows:
| Stock Appreciation Rights (Performance Condition) (in thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value (in millions)
Outstanding at December 31, 2020 | — |  | — |  | — |  | —
Granted | 21 |  | $19.44 |  | — |  | —
Exercised | — |  | — |  | — |  | —
Forfeited/Cancelled | — |  | — |  | — |  | —
Outstanding at December 31, 2021 | 21 |  | $19.44 |  | 2.3 |  | $0.6
Granted | — |  | — |  | — |  | —
Exercised | — |  | — |  | — |  | —
Forfeited/Cancelled | (3) |  | $19.44 |  | — |  | —
Outstanding at December 31, 2022 | 18 |  | $19.44 |  | 1.3 |  | —
Granted | — |  | — |  | — |  | —
Exercised | — |  | — |  | — |  | —
Forfeited/Cancelled | (1) |  | $19.44 |  | — |  | —
Outstanding at December 31, 2023 | 17 |  | $19.44 |  | 0.2 |  | $0.3
Exercisable at December 31, 2023 | 17 |  | $19.44 |  | 0.2 |  | $0.3
Schedule of Share-based Payment Award, Stock Appreciation Rights, Performance Condition, Valuation Assumptions [Table Text Block] |  | The weighted-average assumptions used in the valuation models to determine the fair value of SARs granted to employees under the 2014 Plan are as follows:
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Stock Appreciation Rights Granted (in thousands) | n/a |  | n/a |  | 21.0
Average Risk-Free Rate | n/a |  | n/a |  | 0.3%
Expected Volatility | n/a |  | n/a |  | 82.8%
Expected Term (Years) | n/a |  | n/a |  | 2.5
Dividend Yield | n/a |  | n/a |  | —
Schedule of Notional Stock Units, Activity [Table Text Block] |  | A summary of notional stock units with time-based vesting granted under the 2014 Plan for the year ended December 31, 2023, are as follows:
| Shares (thousands) |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2020 | 571 |  | $3.68
Granted | — |  | —
Vested | (319) |  | —
Forfeited/Cancelled | — |  | —
Nonvested at December 31, 2021 | 252 |  | $4.33
Granted | — |  | —
Vested | (128) |  | $3.16
Forfeited | (2) |  | $5.53
Nonvested at December 31, 2022 | 122 |  | $5.53
Granted | — |  | —
Vested | (104) |  | $5.53
Forfeited | (18) |  | $5.53
Nonvested at December 31, 2023 | — |  | —
Schedule of Notional Stock Units, Performance Condition, Activity [Table Text Block] |  | A summary of notional stock units with performance-based vesting granted under the 2014 Plan for the year ended December 31, 2023, are as follows:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2020 | — |  | —
Granted | 10 |  | $39.55
Vested | — |  | —
Forfeited | — |  | —
Nonvested at December 31, 2021 | 10 |  | $39.55
Granted | — |  | —
Vested | — |  | —
Forfeited | (2) |  | $39.55
Nonvested at December 31, 2022 | 8 |  | $39.55
Granted | — |  | —
Vested | — |  | —
Forfeited | — |  | —
Nonvested at December 31, 2023 | 8 |  | $39.55
Restricted Stock (Performance Condition) - 2022 Award A summary of restricted stock with performance-based vesting granted under the 2014 Plan for the year ended December 31, 2023, are as follows:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2021 | — |  | —
Granted | 24 |  | $33.70
Vested | — |  | —
Forfeited | (2) |  | $33.70
Nonvested at December 31, 2022 | 22 |  | $33.70
Granted | — |  | —
Vested | — |  | —
Forfeited | (5) |  | $33.70
Nonvested at December 31, 2023 | 17 |  | $33.70
A summary of restricted stock with performance-based vesting granted under the 2014 Plan for the year ended December 31, 2023, are as follows:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2022 | — |  | —
Granted | 17 |  | $42.70
Vested | — |  | —
Forfeited | (6) |  | $42.70
Nonvested at December 31, 2023 | 11 |  | $42.70

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- Definition Tabular disclosure of the changes in outstanding nonvested performance-based units. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock awards granted to nonemployee directors that were outstanding at the beginning and end of the year, and the number of awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for stock appreciation rights awards that were outstanding at the beginning and end of the year, and the number of stock appreciation rights awards that were granted, exercised or converted, forfeited, and expired during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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