Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2013

Regulatory Assets and Liabilities (Tables) [Abstract]

Regulatory assets and liabilities

Our regulatory assets and liabilities as of December 31 consist of:

	2013		2012
	(Millions of Dollars)
Regulatory Assets
Deferred unrecognized pension costs	$	537.6	$	731.5
Deferred income tax related	169.5		176.5
Escrowed electric transmission costs	126.8		114.1
Escrowed conservation	66.9		73.5
Deferred plant related -- capital lease	56.5		66.6
Deferred environmental costs	47.0		47.4
Other, net	104.2		170.7
Total regulatory assets	$	1,108.5	$	1,380.3
Regulatory Liabilities
Deferred cost of removal obligations	$	724.5	$	725.0
Escrowed bad debt costs	64.6		81.1
Other, net	90.0		62.2
Total regulatory liabilities	$	879.1	$	868.3