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OPERATING REVENUES - DISAGGREGATION OF OPERATING REVENUES BY SEGMENT (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Operating Revenues
Operating revenues	$ 1,643.7	$ 1,657.5	$ 5,602.7	$ 5,593.5
Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,635.7		5,599.3
Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	8.0		3.4
Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,622.1		5,561.1
Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,218.3		3,370.2
Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	403.8		2,190.9
Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	406.5		2,183.9
Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	13.6		38.2
Total Utility Operations
Disaggregation of Operating Revenues
Operating revenues	1,636.8		5,569.0
Total Utility Operations | Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	7.9		2.9
Total Utility Operations | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,628.9		5,566.1
Total Utility Operations | Total utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,624.8		5,554.1
Total Utility Operations | Electric | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,218.3		3,370.2
Total Utility Operations | Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	406.5		2,183.9
Total Utility Operations | Other non-utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	4.1		12.0
Wisconsin
Disaggregation of Operating Revenues
Operating revenues	1,388.7		4,303.3
Wisconsin | Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	3.0		11.3
Wisconsin | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,385.7		4,292.0
Wisconsin | Total utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,385.7		4,292.0
Wisconsin | Electric | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	1,218.3		3,370.2
Wisconsin | Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	167.4		921.8
Wisconsin | Other non-utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Illinois
Disaggregation of Operating Revenues
Operating revenues	197.9		973.2
Illinois | Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	4.6		(1.6)
Illinois | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	193.3		974.8
Illinois | Total utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	193.2		974.6
Illinois | Electric | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Illinois | Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	193.2		974.6
Illinois | Other non-utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.1		0.2
Other States
Disaggregation of Operating Revenues
Operating revenues	50.2		292.5
Other States | Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	0.3		(6.8)
Other States | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	49.9		299.3
Other States | Total utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	45.9		287.5
Other States | Electric | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Other States | Natural gas | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	45.9		287.5
Other States | Other non-utility revenues | Transferred over time | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	4.0		11.8
Electric Transmission
Disaggregation of Operating Revenues
Operating revenues	0.0		0.0
Electric Transmission | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Electric Transmission | Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	0.0		0.0
Electric Transmission | Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Electric Transmission | Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Electric Transmission | Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Electric Transmission | Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Non-Utility Energy Infrastructure
Disaggregation of Operating Revenues
Operating revenues	115.2		350.3
Non-Utility Energy Infrastructure | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	17.9		59.2
Non-Utility Energy Infrastructure | Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	97.3		291.1
Non-Utility Energy Infrastructure | Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	10.0		34.9
Non-Utility Energy Infrastructure | Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Non-Utility Energy Infrastructure | Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	10.0		34.9
Non-Utility Energy Infrastructure | Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	7.9		24.3
Corporate and Other
Disaggregation of Operating Revenues
Operating revenues	2.4		6.9
Corporate and Other | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	2.3		6.4
Corporate and Other | Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	0.1		0.5
Corporate and Other | Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Corporate and Other | Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Corporate and Other | Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Corporate and Other | Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	2.3		6.4
Reconciling Eliminations
Disaggregation of Operating Revenues
Operating revenues	(110.7)		(323.5)
Reconciling Eliminations | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	(13.4)		(32.4)
Reconciling Eliminations | Other operating revenues
Disaggregation of Operating Revenues
Operating revenues	(97.3)		(291.1)
Reconciling Eliminations | Total utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	(12.7)		(27.9)
Reconciling Eliminations | Electric | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0		0.0
Reconciling Eliminations | Natural gas | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	(12.7)		(27.9)
Reconciling Eliminations | Other non-utility revenues | Revenues from contracts with customers
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ (0.7)		$ (4.5)

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