XML 55 R44.htm IDEA: XBRL DOCUMENT v3.5.0.2

Acquisition - General (Details)	Jun. 29, 2015
Business Combinations [Abstract]
Percentage of Integrys common shares acquired	100.00%

X

- References

No definition available.

+ Details

Name:	us-gaap_BusinessCombinationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of Integrys common shares acquired

+ References

No definition available.

+ Details

Name:	wec_PercentageofIntegryscommonsharesacquired
Namespace Prefix:	wec_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant