PROPERTY, PLANT, AND EQUIPMENT (Tables)

12 Months Ended

Dec. 31, 2016

Property, Plant and Equipment [Abstract]

Schedule of property, plant, and equipment

Property, plant, and equipment consisted of the following utility and non-utility assets at December 31:

(in millions)	2016		2015
Utility property, plant, and equipment	$	5,144.5	$	4,541.2
Less: Accumulated depreciation	1,594.7		1,559.6
Net	3,549.8		2,981.6
CWIP	111.9		434.2
Net utility property, plant, and equipment	3,661.7		3,415.8
Non-utility property, plant, and equipment	0.7		8.9
Less: Accumulated depreciation	0.4		6.1
Net non-utility plant	0.3		2.8
Total property, plant, and equipment	$	3,662.0	$	3,418.6