Segment Information (Tables)

3 Months Ended

Mar. 31, 2019

Segment Reporting [Abstract]

Results from Operations by Reportable Segment

(Millions of Dollars)	2019			2018
Regulated Electric
Operating revenues	$	741.5		$	698.3
Intersegment revenues	0.1			0.1
Total revenue	741.6			698.4
Net income	82.4			79.6
Regulated Natural Gas
Operating revenues	$	469.1		$	364.0
Intersegment revenues	0.1			0.1
Total revenue	469.2			364.1
Net income	59.2			53.7
All Other
Operating revenues (a)	$	12.4		$	11.0
Intersegment revenues	—			—
Total revenue	12.4			11.0
Net income (loss)	(2.8		)	0.4
Consolidated Total
Operating revenues (a)	$	1,223.2		$	1,073.5
Intersegment revenues	(0.2		)	(0.2		)
Total revenue	1,223.0			1,073.3
Net income	138.8			133.7

^(a)  Operating revenues include $1.1 million of other affiliate revenue for the three months ended March 31, 2019 and 2018.