Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Reconciliation of Basic and Diluted Earnings Per Share Computations

The following table provides a reconciliation of basic and diluted earnings per share computations for the three months ended March 31, 2020 and 2019:

	Three Months Ended March 31,
(Millions of dollars, except share and per share amounts)	2020		2019
Earnings per common share:
Net income per share - basic
Net income attributable to common stockholders	$	89.3	$	5.3
Weighted average common shares outstanding (in thousands)	30,235		32,206
Earnings per common share	$	2.95	$	0.16

Earnings per common share - assuming dilution:
Net income per share - diluted
Net income attributable to common stockholders	$	89.3	$	5.3
Weighted average common shares outstanding (in thousands)	30,235		32,206
Common equivalent shares:
Dilutive share-based awards	306		214
Weighted average common shares outstanding - assuming dilution (in thousands)	30,541		32,420
Earnings per common share assuming dilution	$	2.92	$	0.16