SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES CONSOLIDATED BASIS OF PRESENTATION (Details)	Dec. 31, 2013 subsidiary
Accounting Policies [Abstract]
Number of wholly owned subsidiaries	1

Represents the number of wholly owned subsidiaries.

No definition available.

Name:	wps_Numberofwhollyownedsubsidiaries
Namespace Prefix:	wps_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant