Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 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 and nine months ended September 30, 2020 and 2019:

	Three Months Ended September 30,				Nine Months Ended September 30,
(Millions of dollars, except share and per share amounts)	2020		2019		2020		2019
Earnings per common share:
Net income per share - basic
Net income attributable to common stockholders	$	66.9	$	69.2	$	325.1	$	107.2
Weighted average common shares outstanding (in thousands)	29,111		31,447		29,546		31,961
Earnings per common share	$	2.30	$	2.20	$	11.00	$	3.35

Earnings per common share - assuming dilution:
Net income per share - diluted
Net income attributable to common stockholders	$	66.9	$	69.2	$	325.1	$	107.2
Weighted average common shares outstanding (in thousands)	29,111		31,447		29,546		31,961
Common equivalent shares:
Dilutive share-based awards	388		257		341		228
Weighted average common shares outstanding - assuming dilution (in thousands)	29,499		31,704		29,887		32,189
Earnings per common share assuming dilution	$	2.27	$	2.18	$	10.88	$	3.33