Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 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 June 30,				Six Months Ended June 30,
	2023		2022		2023		2022
Numerator:
Net income attributable to controlling interests	$	11.4	$	28.6	$	23.4	$	52.4
Denominator:
Weighted-average shares of common stock outstanding—basic	41,484,303		41,425,555		41,464,362		42,690,683
Potential shares of common stock:
Restricted stock units	1,695		6,935		4,617		8,523
Employee stock options	1,159,421		1,085,635		1,209,130		1,216,600
Weighted-average shares of common stock outstanding—diluted	42,645,419		42,518,125		42,678,109		43,915,806
Earnings per share of common stock attributable to controlling interests:
Basic	$	0.27	$	0.69	$	0.56	$	1.23
Diluted	$	0.27	$	0.67	$	0.55	$	1.19