Property Plant and Equipment Property Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property, Plant and Equipment [Abstract]

Public Utility Property, Plant, and Equipment

Major classes of property, plant and equipment

(Millions of Dollars)	Dec. 31, 2019			Dec. 31, 2018
Property, plant and equipment
Electric plant	$	8,453.0		$	7,227.7
CWIP	485.4			847.3
Total property, plant and equipment	8,938.4			8,075.0
Less accumulated depreciation	(2,306.8		)	(2,128.6		)
Property, plant and equipment, net	$	6,631.6		$	5,946.4