Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2015

Commitments and Contingencies Disclosure [Abstract]

Guarantees Issued and Outstanding

The following table presents the guarantee issued and outstanding for NSP-Wisconsin:

(Millions of Dollars)	Sept. 30, 2015		Dec. 31, 2014
Guarantees issued and outstanding	$	1.0	$	1.0
Current exposure under these guarantees	0.1		0.2