Short-Term Debt (Tables)

12 Months Ended

Dec. 31, 2014

Short-term Debt [Abstract]

Short-term notes payable balances and their corresponding weighted-average interest rates

Short-term notes payable balances and their corresponding weighted-average interest rates as of December 31 consist of:

	2014				2013
			Interest				Interest
Short-Term Debt	Balance		Rate		Balance		Rate
	(Millions of Dollars, except for percentages)
Commercial paper	$	617.6	0.22	%	$	537.4	0.20	%

Commercial paper

The following information relates to commercial paper for the years ended December 31:

	2014			2013
	(Millions of Dollars, except for percentages)
Maximum Short-Term Debt Outstanding	$	721.4		$	594.5
Average Short-Term Debt Outstanding	$	468.1		$	359.1
Weighted-Average Interest Rate	0.18		%	0.25		%