Earnings Per Share (Tables)

12 Months Ended

Dec. 31, 2021

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 for the years ended December 31, 2021, 2020 and 2019 is as follows (dollars in millions, except per share data):

	2021		2020		2019
Numerator:
Income from continuing operations attributable to controlling interests	128.1		247.3		196.9
Income from discontinued operations attributable to controlling interests (Note 3)	700.3		39.4		27.0
Net income attributable to controlling interests	828.4		286.7		223.9
Less: Total income available to participating unvested securities(1)	(0.1)		(0.1)		(0.1)
Total net income attributable to common stock	828.3		286.6		223.8
Denominator:
Weighted-average shares of common stock outstanding—basic	77,213,010		81,259,778		91,205,412
Potential shares of common stock:
Restricted stock units	33,175		60,276		63,540
Employee stock options	3,239,739		716,149		—
Weighted-average shares of common stock outstanding—diluted	80,485,924		82,036,203		91,268,952
Earnings per share of common stock attributable to controlling interests:
Basic:
Continuing operations	$	1.66	$	3.04	$	2.16
Discontinued operations	$	9.07	$	0.49	$	0.29
Basic earnings per share of common stock attributable to controlling interests	$	10.73	$	3.53	$	2.45
Diluted
Continuing operations	$	1.59	$	3.01	$	2.16
Discontinued operations	$	8.70	$	0.48	$	0.29
Diluted earnings per share of common stock attributable to controlling interests	$	10.29	$	3.49	$	2.45

(1)Income available to participating unvested securities includes dividends paid on unvested restricted shares and their proportionate share of undistributed earnings.