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Schedule I - Fair Value Measurements (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Carrying amount
Financial instruments
Long-term debt, including current portion	$ 9,561.7	$ 9,285.8
Fair value
Financial instruments
Long-term debt, including current portion	10,341.9	9,818.2
WEC Energy Group
Financial instruments
Long-term note receivable from UMERC	50.0	0.0
WEC Energy Group | Carrying amount
Financial instruments
Long-term note receivable from UMERC	50.0	0.0
Long-term debt, including current portion	1,892.3	1,890.0
WEC Energy Group | Fair value
Financial instruments
Long-term note receivable from UMERC	49.5	0.0
Long-term debt, including current portion	$ 1,941.5	$ 1,906.1

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

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-Publisher FASB
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-SubTopic 210
-Section S99
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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 1 year (or 1 business cycle).

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