Basic earnings per share is calculated by dividing net income attributable to controlling interests by the weighted-average number of shares of common stock outstanding. Diluted earnings per share is similar to basic earnings per share, but is adjusted for the effect of potentially issuable common stock, except when inclusion is anti-dilutive.

The calculation of basic and diluted earnings per share of common stock for the years ended December 31, 2025, 2024 and 2023 is as follows (dollars in millions, except per share data):


	2025		2024		2023
Numerator:




Net income attributable to controlling interests	$	80.0	$	85.0	$	65.8
Denominator:
Weighted-average shares of common stock outstanding—basic	36,191,989		37,770,185		41,493,154
Potential shares of common stock:
Restricted stock units	30,206		22,178		7,448
Employee stock options	—		536,043		1,037,341
Weighted-average shares of common stock outstanding—diluted	36,222,195		38,328,406		42,537,943
Earnings per share of common stock attributable to controlling interests:



Basic	$	2.21	$	2.25	$	1.59



Diluted	$	2.21	$	2.22	$	1.55