Earnings Per Common Share (Tables)

12 Months Ended

Dec. 31, 2019

Earnings Per Share [Abstract]

Computation of basic and diluted earnings per share

The computation of basic and diluted earnings per share follows.

	Year Ended December 31, 2019
	(in millions, except per share amounts)
	Income (Loss)			Average Shares	EPS
Net income	$	113.3
Unvested restricted share participation	(1.1		)
Net income per common share – basic	112.2			47.9	$	2.34
Effect of dilutive securities:
Nonparticipating unvested restricted shares	—			0.5
Net income per common share – diluted	$	112.2		48.4	$	2.32

	Year Ended December 31, 2018
	(in millions, except per share amounts)
	Income (Loss)			Average Shares	EPS
Net income	$	75.7
Unvested restricted share participation	(0.2		)
Net income per common share – basic	75.5			48.8	$	1.55
Effect of dilutive securities:
Nonparticipating unvested restricted shares	—			0.1
Net income per common share – diluted	$	75.5		48.9	$	1.54

	Year Ended December 31, 2017
	(in millions, except per share amounts)
	Income (Loss)		Average Shares	EPS
Net income	$	89.7
Unvested restricted share participation	—
Net income per common share – basic	89.7		48.8	$	1.84
Effect of dilutive securities:
Nonparticipating unvested restricted shares	—		—
Net income per common share – diluted	$	89.7	48.8	$	1.84