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OPERATING REVENUES - DISAGGREGATION OF NATURAL GAS UTILITY OPERATING REVENUES BY CUSTOMER CLASS (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Natural gas
Disaggregation of Operating Revenues
Number of days payment is due		30 days
Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 1,635.7	$ 5,599.3
Revenues from contracts with customers | Natural gas
Disaggregation of Operating Revenues
Revenues from contracts with customers	403.8	2,190.9
Revenues from contracts with customers | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	406.5	2,183.9
Revenues from contracts with customers | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	204.7	1,346.9
Revenues from contracts with customers | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	77.0	568.5
Revenues from contracts with customers | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	281.7	1,915.4
Revenues from contracts with customers | Natural gas | Transferred over time | Transport
Disaggregation of Operating Revenues
Revenues from contracts with customers	62.1	248.5
Revenues from contracts with customers | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	62.7	20.0
Wisconsin | Revenues from contracts with customers | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,385.7	4,292.0
Wisconsin | Revenues from contracts with customers | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	167.4	921.8
Wisconsin | Revenues from contracts with customers | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	71.9	556.7
Wisconsin | Revenues from contracts with customers | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	35.0	286.4
Wisconsin | Revenues from contracts with customers | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	106.9	843.1
Wisconsin | Revenues from contracts with customers | Natural gas | Transferred over time | Transport
Disaggregation of Operating Revenues
Revenues from contracts with customers	13.9	51.3
Wisconsin | Revenues from contracts with customers | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	46.6	27.4
Illinois | Revenues from contracts with customers | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	193.3	974.8
Illinois | Revenues from contracts with customers | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	193.2	974.6
Illinois | Revenues from contracts with customers | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	112.7	609.0
Illinois | Revenues from contracts with customers | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	29.4	186.1
Illinois | Revenues from contracts with customers | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	142.1	795.1
Illinois | Revenues from contracts with customers | Natural gas | Transferred over time | Transport
Disaggregation of Operating Revenues
Revenues from contracts with customers	43.3	175.6
Illinois | Revenues from contracts with customers | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	7.8	3.9
Other States | Revenues from contracts with customers | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	49.9	299.3
Other States | Revenues from contracts with customers | Natural gas | Transferred over time
Disaggregation of Operating Revenues
Revenues from contracts with customers	45.9	287.5
Other States | Revenues from contracts with customers | Natural gas | Transferred over time | Residential
Disaggregation of Operating Revenues
Revenues from contracts with customers	20.1	181.2
Other States | Revenues from contracts with customers | Natural gas | Transferred over time | Commercial and industrial
Disaggregation of Operating Revenues
Revenues from contracts with customers	12.6	96.0
Other States | Revenues from contracts with customers | Natural gas | Transferred over time | Total retail revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	32.7	277.2
Other States | Revenues from contracts with customers | Natural gas | Transferred over time | Transport
Disaggregation of Operating Revenues
Revenues from contracts with customers	4.9	21.6
Other States | Revenues from contracts with customers | Natural gas | Transferred over time | Other utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 8.3	$ (11.3)

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