Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2023

Earnings Per Share [Abstract]

Schedule of Calculation of Pro Forma Basic and Diluted Earnings Per Share

The calculation of basic and diluted earnings per share of common stock is as follows (dollars in millions, except per share data):

	Three Months Ended March 31,
	2023		2022
Numerator:
Net income attributable to common stock	$	12.0	$	23.8
Denominator:
Weighted-average shares of common stock outstanding—basic	41,444,200		43,969,713
Potential shares of common stock:
Restricted stock units	7,539		10,112
Employee stock options	1,258,838		1,347,565
Weighted-average shares of common stock outstanding—diluted	42,710,577		45,327,390
Earnings per share of common stock attributable to controlling interests:
Basic	$	0.29	$	0.54
Diluted	$	0.28	$	0.53