Common Equity (Tables)

6 Months Ended

Jun. 30, 2020

Equity [Abstract]

Calculation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share for the three and six months ended June 30, 2020 and 2019.

	Three Months Ended June 30,				Six Months Ended June 30,
(in millions, except per share data)	2020		2019		2020		2019
Numerator:
Net income available to common shareholders	$	46.5	$	34.5	$	90.3	$	71.4
Denominator:
Weighted average common shares outstanding	177.2		177.1		177.2		177.1
Effect of dilutive restricted share units	0.2		0.3		0.2		0.3
Weighted average diluted common shares outstanding (1)	177.5		177.4		177.4		177.4
Basic earnings per common share	$	0.26	$	0.19	$	0.51	$	0.40
Diluted earnings per common share	0.26		0.19		0.51		0.40

(1)  Weighted average diluted common shares outstanding may not sum due to rounding.