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 and other assets at December 31:

(in millions)	2016		2015
Utility property, plant, and equipment	$	11,232.9	$	10,863.1
Less: Accumulated depreciation	3,606.9		3,447.2
Net	7,626.0		7,415.9
CWIP	111.5		170.3
Net utility property, plant, and equipment	7,737.5		7,586.2
Property under capital leases	2,898.0		2,876.7
Less: Accumulated amortization	837.8		735.0
Net leased facilities	2,060.2		2,141.7
Non-utility and other property, plant, and equipment	46.4		54.0
Less: Accumulated depreciation	12.7		14.7
Net	33.7		39.3
CWIP	0.9		0.3
Net non-utility and other property, plant, and equipment	34.6		39.6
Total property, plant, and equipment	$	9,832.3	$	9,767.5