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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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