The tables below illustrate the reconciliation of the earnings and number of shares used in our calculation of basic and diluted earnings per share attributable to common stockholders.


	Three Months Ended
(in millions, except per share amounts)	March 31, 2025		March 31, 2024
Net income attributable to common stockholders	$	56	$	47
Shares for basic earnings per share	35.1		35.5
Basic earnings per share	$	1.60	$	1.32


	Three Months Ended
(in millions, except per share amounts)	March 31, 2025		March 31, 2024
Net income attributable to common stockholders	$	56	$	47
Add back of interest expense related to convertible notes, net of tax	5		5
Numerator used to calculate diluted earnings per share	$	61	$	52

Shares for basic earnings per share	35.1		35.5
Effect of dilutive shares outstanding

Restricted stock units	0.2		0.1
2026 Convertible Notes	3.7		3.6
2027 Convertible Notes	3.0		3.0
Shares for diluted earnings per share	42.0		42.2
Diluted earnings per share	$	1.46	$	1.22

The computations of diluted earnings per share attributable to common stockholders above exclude approximately 529,000 and 396,000 shares of common stock, the maximum number of shares issuable as of March 31, 2025 and March 31, 2024, respectively, upon the vesting of certain performance-based awards, because the performance conditions required to be met for the shares subject to such awards to vest were not achieved by the end of the reporting period.