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SHORT-TERM DEBT AND LINES OF CREDIT - REVOLVING CREDIT FACILITIES (Details) - USD ($) $ in Millions | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 2,500.0 |
Letters of credit issued inside credit facilities | 29.1 |
Commercial Paper | 670.4 | $ 860.2
Available capacity under existing agreements | 1,800.5 |
WEC Energy Group | Credit facility maturing December 2020 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | 1,050.0 |
Wisconsin Electric | Credit facility maturing December 2020 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | 500.0 |
WPS | Credit facility maturing December 2020 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | 250.0 |
Wisconsin Gas | Credit facility maturing December 2020 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | 350.0 |
PGL | Credit facility maturing December 2020 |  |
Line of Credit Facility [Line Items] |  |
Short-term credit capacity | $ 350.0 |

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- Definition Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(19)(a)(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(13)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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