The following table sets forth the components of our stock-based compensation and expected tax benefit for the three months ended March 31, 2025 and 2024 related to the plans in effect during the respective period:


	Three months ended March 31,
Stock-based compensation expense:	2025		2024
Restricted stock and restricted stock units	$	14.0	$	16.1
Stock options (1)	0.7		1.8
Total compensation expense	$	14.7	$	17.9

Expected tax benefit:
Restricted stock and restricted stock units	$	1.5	$	1.6
Stock options	—		0.1
Total expected tax benefit	$	1.5	$	1.7

(1)Lower expense for stock options was primarily due to the impact of the accelerated attribution method used to recognize expense for the performance-based stock option grants.

We accounted for stock options based on grant date fair value. Service condition options were valued using the Black-Scholes valuation model. Market condition options were valued using a Monte Carlo valuation model.

The following table summarizes the stock options activity for the three months ended March 31, 2025:


	Stock options
	Number of options	Weighted-average exercise price	Weighted-average remaining contractual term (in years)	Aggregate intrinsic value
Balances, January 1, 2025	10,801,369	$19.33	4.7	$—
Granted	—	$—
Forfeited	—	$—
Exercised	—	$—
Balances, March 31, 2025	10,801,369	$19.33	4.5	$—

Expected to vest as of March 31, 2025	4,721,369	$15.89	7.4	$—
Exercisable as of March 31, 2025	6,080,000	$22.00	2.2	$—

As of March 31, 2025, total unrecognized compensation cost related to stock options was $1.0 million, which was expected to be recognized over a weighted average period of 0.3 years.

Restricted stock and restricted stock units are valued on the award grant date at the closing market price of our stock.

The following table summarizes the restricted stock and restricted stock units activity for the three months ended March 31, 2025:


	Restricted stock and Restricted stock units
	Number of shares	Weighted-average grant date fair value	Weighted-average remaining contractual term (in years)	Aggregate intrinsic value
Balances, January 1, 2025	10,008,303	$11.57	0.9	$124.7
Granted	6,766,753	$8.40
Forfeited	(82,678)	$11.20
Vested	(4,117,805)	$11.98
Balances, March 31, 2025	12,574,573	$9.73	1.6	$112.4

As of March 31, 2025, total unrecognized compensation cost related to non-vested restricted stock and restricted stock units was $84.1 million, which is expected to be recognized over a weighted average period of 2.2 years.