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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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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.

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