Stock-Based Compensation (Tables)
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12 Months Ended |
Dec. 31, 2025 |
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| Share-Based Payment Arrangement, Noncash Expense [Abstract] |
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| 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, | | | 2025 | | 2024 | | 2023 | | | | | | | | | Notional stock units and stock appreciation rights | $ | — | | | $ | — | | | $ | 1.0 | | | Restricted stock | $ | 0.7 | | | $ | 0.5 | | | $ | 0.4 | | | BOD and employee restricted stock units | 4.8 | | | 1.0 | | | 0.9 | | Common stock | 0.2 | | | — | | | — | | | Total stock-based compensation costs | $ | 5.7 | | | $ | 1.5 | | | $ | 2.3 | | | | | | | | | Total recognized tax benefit | $ | (1.2) | | | $ | (0.3) | | | $ | (0.3) | |
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| 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, 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 | | Granted | 4 | | | $190.04 | | Vested | (21) | | | $41.65 | | Forfeited | (1) | | | $190.04 | Nonvested at December 31, 2025 | 3 | | | $190.04 |
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| 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, 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 | | Granted | 6 | | | $113.43 | | Vested | (4) | | | $55.54 | | Forfeited | — | | | — | Nonvested at December 31, 2025 | 18 | | $73.84 |
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| 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, 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 and 2025 | — | | | — | | — | | — | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Exercisable at December 31, 2025 | — | | | — | | — | | — |
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| 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, 2022 | 70 | | | $5.53 | | 0.3 | | $2.7 | | Granted | — | | | — | | — | | — | | Exercised | (74) | | | $5.53 | | — | | — | | Forfeited/Cancelled | 4 | | | $5.53 | | — | | — | Outstanding at December 31, 2023, 2024 and 2025 | — | | | — | | — | | — | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Exercisable at December 31, 2025 | — | | | — | | — | | — |
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| 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, 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 and 2025 | — | | | — | | — | | — | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Exercisable at December 31, 2025 | — | | | — | | — | | — |
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| 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:
| | | | | | | | | | | | | | | | | | | | | | | | | 2019 and 2020 Awards | | 2021 Award | | Shares (in thousands) | | Weighted Average Grant Date Fair Value (per share) | | Shares (in thousands) | | Weighted Average Grant Date Fair Value (per share) | | | | | | | | | Nonvested at December 31, 2022 | 122 | | | $5.53 | | 8 | | | $39.55 | | Granted | — | | | — | | — | | | — | Vested | (104) | | | $5.53 | | — | | | — | | Forfeited/Cancelled | (18) | | | $5.53 | | — | | | — | Nonvested at December 31, 2023 | — | | | — | | 8 | | | $39.55 | | Granted | — | | | — | | — | | | — | | Vested | — | | | — | | (8) | | | $39.55 | | Forfeited/Cancelled | — | | | — | | — | | | — | Nonvested at December 31, 2024 and 2025 | — | | | — | | — | | | — | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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| Schedule of Notional Stock Units, Performance Condition, Activity [Table Text Block] |
Restricted Stock (Performance Condition)
A summary of restricted stock with performance-based vesting granted under the 2014 Plan is as follows:
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 2022 Award | | 2023 Award | | 2024 Award | | 2025 Award | | Shares
(in thousands) | | Weighted Average Grant Date Fair Value (per share) | | Shares
(in thousands) | | Weighted Average Grant Date Fair Value (per share) | | Shares
(in thousands) | | Weighted Average Grant Date Fair Value (per share) | | Shares
(in thousands) | | Weighted Average Grant Date Fair Value (per share) | | | | | | | | | | | | | | | | | Nonvested at December 31, 2022 | 22 | | | $33.70 | | — | | | — | | — | | | — | | — | | | — | | Granted | — | | | — | | 17 | | | $42.70 | | — | | | — | | — | | | — | | Vested | — | | | — | | — | | | — | | — | | | — | | — | | | — | | Forfeited | (5) | | | $33.70 | | (6) | | | $42.70 | | — | | | — | | — | | | — | Nonvested at December 31, 2023 | 17 | | | $33.70 | | 11 | | | $42.70 | | — | | | — | | — | | | — | | Granted | — | | | — | | — | | | — | | 24 | | | $38.67 | | — | | | — | | Vested | — | | | — | | — | | | — | | — | | | — | | — | | | — | | Forfeited | — | | | — | | — | | | — | | — | | | — | | — | | | — | Nonvested at December 31, 2024 | 17 | | | $33.70 | | 11 | | | $42.70 | | 24 | | | $38.67 | | — | | | — | | Granted | — | | | — | | — | | | — | | — | | | — | | 12 | | | $84.40 | | Vested | (17) | | | $33.70 | | (2) | | | $42.70 | | (3) | | | $38.67 | | (1) | | | $84.40 | | Forfeited | — | | | — | | (1) | | | $42.70 | | (4) | | | $38.67 | | (2) | | | $84.40 | Nonvested at December 31, 2025 | — | | | — | | 8 | | | $42.70 | | 17 | | | $38.67 | | 9 | | | $84.40 | | | | | | | | | | | | | | | | |
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