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Stock-Based Compensation (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2024
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,
| 2024 |  | 2023 |  | 2022
Notional stock units and stock appreciation rights | $ | — |  |  | $ | 1.0 |  |  | $ | 0.9 |
Restricted stock | 0.5 |  |  | 0.4 |  |  | 0.2 |
BOD and employee restricted stock units | 1.0 |  |  | 0.9 |  |  | 0.7 |
Stock options | — |  |  | — |  |  | 0.1 |
Total stock-based compensation costs | $ | 1.5 |  |  | $ | 2.3 |  |  | $ | 1.9 |
Total recognized tax benefit | $ | (0.3) |  |  | $ | (0.3) |  |  | $ | (0.2) |
Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity [Table Text Block] |  | Centrus’ board restricted stock activity is as follows:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
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
Granted | 21 |  |  | $41.65
Vested | (14) |  |  | $35.95
Forfeited | (3) |  |  | $35.95
Nonvested at December 31, 2024 | 21 |  |  | $41.65
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block] |  | Centrus’ employee restricted stock activity is as follows:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
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
Granted | — |  |  | —
Vested | (5) |  |  | $49.23
Forfeited | — |  |  | —
Nonvested at December 31, 2024 | 16 |  | $55.54
Share-based Compensation, Stock Options, Activity [Table Text Block] |  | A summary of stock option activity is as follows:
| Stock Options (in thousands) |  | Weighted Average Exercise Price (per share) |  | Weighted Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value (in millions)
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
Granted | — |  |  | — |  | — |  | —
Exercised | (96) |  |  | $4.37 |  | — |  | —
Forfeited/Cancelled | — |  |  | — |  | — |  | —
Outstanding at December 31, 2024 | — |  |  | — |  | — |  | —
Exercisable at December 31, 2024 | — |  |  | — |  | — |  | —
Share-based Payment Arrangement, Stock Appreciation Right, Activity [Table Text Block] |  | A summary of SARs with time-based vesting granted under the 2014 Plan is as follows:
| Stock Appreciation Rights (in thousands) |  | Weighted Average Exercise Price (per share) |  | Weighted Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value (in millions)
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 | — |  |  | — |  | — |  | —
Granted | — |  |  | — |  | — |  | —
Exercised | — |  |  | — |  | — |  | —
Forfeited/Cancelled | — |  |  | — |  | — |  | —
Outstanding at December 31, 2024 | — |  |  | — |  | — |  | —
Exercisable at December 31, 2024 | — |  |  | — |  | — |  | —
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 is as follows:
| Stock Appreciation Rights (in thousands) |  | Weighted Average Exercise Price (per share) |  | Weighted Average Remaining Contractual Life in Years |  | Aggregate Intrinsic Value (in millions)
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
Granted | — |  |  | — |  | — |  | —
Exercised | (17) |  |  | $19.44 |  | — |  | —
Forfeited/Cancelled | — |  |  | — |  | — |  | —
Outstanding at December 31, 2024 | — |  |  | — |  | — |  | —
Exercisable at December 31, 2024 | — |  |  | — |  | — |  | —
Schedule of Notional Stock Units, Activity [Table Text Block] |  | A summary of notional stock units with time-based vesting granted under the 2014 Plan is as follows:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2021 | 252 |  |  | $4.33
Granted | — |  |  | —
Vested | (128) |  |  | $3.16
Forfeited/Cancelled | (2) |  |  | $5.53
Nonvested at December 31, 2022 | 122 |  |  | $5.53
Granted | — |  |  | —
Vested | (104) |  |  | $5.53
Forfeited/Cancelled | (18) |  |  | $5.53
Nonvested at December 31, 2023 | — |  |  | —
Granted | — |  |  | —
Vested | — |  |  | —
Forfeited/Cancelled | — |  |  | —
Nonvested at December 31, 2024 | — |  |  | —
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 is as follows:
| Shares (in thousands) |  | Weighted Average Grant Date Fair Value (per share)
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
Granted | — |  |  | —
Vested | (8) |  |  | $39.55
Forfeited | — |  |  | —
Nonvested at December 31, 2024 | — |  |  | —
Restricted Stock (Performance Condition) - 2022 Award A summary of restricted stock with performance-based vesting granted under the 2014 Plan is 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
Granted | — |  |  | —
Vested | — |  |  | —
Forfeited | — |  |  | —
Nonvested at December 31, 2024 | 17 |  |  | $33.70
A summary of restricted stock with performance-based vesting granted under the 2014 Plan is 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
Granted | — |  |  | —
Vested | — |  |  | —
Forfeited | — |  |  | —
Nonvested at December 31, 2024 | 11 |  |  | $42.70

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- Definition Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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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 -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -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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