Earnings (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

Common Stock Reconciliation of Basic and Diluted Earnings Per Share

The reconciliation of basic earnings (loss) per share on common stock for 2023, 2022 and 2021 follows (in millions of dollars except per share data):

	2023		2022		2021
Net earnings (loss)	$	36.4	$	(62.5)	$	156.1
Less: Earnings allocated to participating securities	(0.7)		—		(1.4)
Net earnings (loss) available to common shareholders	$	35.7	$	(62.5)	$	154.7
Average common shares outstanding (millions):
Basic	35.9		38.1		39.4
Dilutive share awards	0.4		—		0.1
Diluted	36.3		38.1		39.5
Basic earnings (loss) per share	$	0.99	$	(1.64)	$	3.93
Diluted earnings (loss) per share	$	0.98	$	(1.64)	$	3.91