Basic earnings per common share is computed by dividing net income available to common stockholders by the weighted average of common shares outstanding during the period. Diluted earnings per common share adjusts basic earnings per common share for the effects of stock options and restricted stock in the periods where such items are dilutive.

On May 2, 2023, the Board of Directors approved a share repurchase authorization of up to $1.5 billion, excluding excise taxes, that expires December 31, 2028. As of June 30, 2026, approximately $145.1 million remained under the 2023 authorization. On October 29, 2025, the Company announced that the Board of Directors approved a new share repurchase authorization of up to $2.0 billion, excluding excise taxes, to be executed by December 31, 2030. This authorization will commence at the conclusion of the existing 2023 authorization.

For the six months ended June 30, 2026, the Company repurchased 312,087 shares of common stock for an average price of $473.40 per share including brokerage fees and excise tax. For the six months ended June 30, 2025, 791,827 shares were repurchased for an average price of $458.58 per share.

The following tables provide a reconciliation of basic and diluted earnings per share computations for the three and six months ended June 30, 2026 and 2025:


	Three Months Ended June 30,				Six Months Ended June 30,
(Millions of dollars, except share and per share amounts)	2026		2025		2026		2025
Earnings per common share:
Net income per share - basic


Net income attributable to common stockholders	$	209.1	$	145.6	$	345.4	$	198.8

Weighted average common shares outstanding (in thousands)	18,438		19,546		18,478		19,738

Earnings per common share	$	11.34	$	7.44	$	18.69	$	10.07


	Three Months Ended June 30,				Six Months Ended June 30,
(Millions of dollars, except share and per share amounts)	2026		2025		2026		2025
Earnings per common share - assuming dilution:
Net income per share - diluted


Net income attributable to common stockholders	$	209.1	$	145.6	$	345.4	$	198.8

Weighted average common shares outstanding (in thousands)	18,438		19,546		18,478		19,738
Common equivalent shares:
Dilutive share-based awards	114		219		150		247
Weighted average common shares outstanding - assuming dilution (in thousands)	18,552		19,765		18,628		19,985

Earnings per common share assuming dilution	$	11.27	$	7.36	$	18.54	$	9.95

We have excluded from the earnings-per-share calculation certain stock options and shares that are considered to be anti-dilutive under the treasury stock method and are reported in the table below.


	Three Months Ended June 30,		Six Months Ended June 30,
Potentially dilutive shares excluded from the calculation as their inclusion would be anti-dilutive	2026	2025	2026	2025
Stock Options	12,118	61,110	42,084	54,404
RSUs	—	—	6,032	—
PSUs	126	9,220	127	7,081
Total anti-dilutive shares	12,244	70,330	48,243	61,485