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Stock-Based Compensation (Tables)
3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 31, 2022
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,
 202220212020
 
Notional stock units and stock appreciation rights$0.9 $11.6 $6.6 
Restricted stock0.2 — — 
BOD and employee restricted stock units0.7 0.5 0.4 
Stock options0.1 0.1 0.1 
Total stock-based compensation costs$1.9 $12.2 $7.1 
Total recognized tax benefit$(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, 2019
74$3.09
Granted47$10.38
Vested(74)$3.09
Forfeited
Nonvested at December 31, 2020
47$10.38
Granted20$25.13
Vested(47)$10.38
Forfeited
Nonvested at December 31, 2021
20$25.13
Granted28$38.80
Vested(20)$25.13
Forfeited
Nonvested at December 31, 2022
28$38.80
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
Granted4$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
Share-based Compensation, Stock Options, Activity [Table Text Block]   A summary of stock option activity follows:
Stock Options (in thousands)Weighted Average Exercise PriceWeighted Average Remaining Contractual Life in YearsAggregate Intrinsic Value (in millions)
Outstanding at December 31, 2019
518$4.026.2$1.5
Granted
Exercised(107)$3.43
Forfeited/Cancelled
Outstanding at December 31, 2020
411$4.185.3$7.8
Granted
Exercised(217)$4.17
Forfeited/Cancelled
Outstanding at December 31, 2021
194$4.184.4$8.9
Granted
Exercised(98)$4.00
Forfeited/Cancelled
Outstanding at December 31, 2022
96$4.372.2$2.7
Exercisable at December 31, 2022
96$4.372.2$2.7
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, 2022, are as follows:
Stock Exercise PriceOptions Outstanding (thousands)Remaining Contractual Life in YearsOptions Exercisable (thousands)
$4.37962.296
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, 2022, are as follows:
Stock Appreciation Rights (in thousands) Weighted Average Exercise PriceWeighted Average Remaining Contractual Life in YearsAggregate Intrinsic Value (in millions)
Outstanding at December 31, 2019
Granted84$5.53
Exercised
Forfeited/Cancelled
Outstanding at December 31, 2020
84$5.532.3$1.5
Granted
Exercised
Forfeited/Cancelled
Outstanding at December 31, 2021
84$5.531.3$3.7
Granted
Exercised
Forfeited/Cancelled(14)$5.53
Outstanding at December 31, 2022
70$5.530.3$2.7
Exercisable at December 31, 2022
70$5.530.3$2.7
Schedule of Share-based Payment Award, Stock Appreciation Rights, 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,
202220212020
SARs Granted (in thousands)n/an/a83.5
Average Risk-Free Raten/an/a0.14%
Expected Volatilityn/an/a94%
Expected Term (Years)n/an/a2.3
Dividend Yieldn/an/a
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, 2022, are as follows:
Stock Appreciation Rights (Performance Condition) (in thousands)Weighted Average Exercise PriceWeighted Average Remaining Contractual Life in YearsAggregate Intrinsic Value (in millions)
Outstanding at December 31, 2020
Granted21$19.44
Exercised
Forfeited/Cancelled
Outstanding at December 31, 2021
21$19.442.3$0.6
Granted
Exercised
Forfeited/Cancelled(3)$19.44
Outstanding at December 31, 2022
18$19.441.3
Exercisable at December 31, 2022
18$19.441.3
 
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,
202220212020
Stock Appreciation Rights Granted (in thousands)n/a21.0n/a
Average Risk-Free Raten/a0.3%n/a
Expected Volatilityn/a82.8%n/a
Expected Term (Years)n/a2.5n/a
Dividend Yieldn/an/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, 2022, are as follows:
Shares (thousands)Weighted Average Grant Date Fair Value (per share)
Outstanding at December 31, 2019
468$3.16
Granted125$5.53
Exercised
Forfeited/Cancelled(22)$3.16
Nonvested at December 31, 2020
571$3.68
Granted
Vested(319)
Forfeited
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
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, 2022, are as follows:
Shares
(in thousands)
Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2020
Granted10$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
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, 2022, are as follows:
Shares
(in thousands)
Weighted Average Grant Date Fair Value (per share)
Nonvested at December 31, 2021
Granted24$33.70
Vested
Forfeited(2)$33.70
Nonvested at December 31, 2022
22$33.70