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OPERATING REVENUES - DISAGGREGATION OF NATURAL GAS UTILITY OPERATING REVENUES BY CUSTOMER CLASS (Details) - Revenues from contracts with customers - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Disaggregation of Operating Revenues        
Revenues from contracts with customers $ 1,563.9 $ 1,673.6 $ 3,940.4 $ 3,963.6
Natural gas        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 524.8 576.4 1,821.2 1,787.1
Natural gas | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 524.1 579.1 1,818.8 1,777.4
Natural gas | Transferred over time | Total retail revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 441.0 459.2 1,692.0 1,633.7
Natural gas | Transferred over time | Residential        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 319.6 329.7 1,182.7 1,142.2
Natural gas | Transferred over time | Commercial and industrial        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 121.4 129.5 509.3 491.5
Natural gas | Transferred over time | Transport        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 69.3 77.8 189.5 186.4
Total Utility Operations | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 1,550.2 1,667.3 3,910.9 3,937.2
Total Utility Operations | Natural gas | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 524.1 579.1 1,818.8 1,777.4
Total Utility Operations | Natural gas | Transferred over time | Other utility revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 13.8 42.1 (62.7) (42.7)
Wisconsin | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 1,249.2 1,320.6 2,875.9 2,906.3
Wisconsin | Natural gas | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 227.3 236.4 792.2 754.4
Wisconsin | Natural gas | Transferred over time | Total retail revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 182.0 191.6 765.6 736.2
Wisconsin | Natural gas | Transferred over time | Residential        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 126.2 128.1 510.1 484.8
Wisconsin | Natural gas | Transferred over time | Commercial and industrial        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 55.8 63.5 255.5 251.4
Wisconsin | Natural gas | Transferred over time | Transport        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 16.2 16.4 38.1 37.4
Wisconsin | Natural gas | Transferred over time | Other utility revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 29.1 28.4 (11.5) (19.2)
Illinois | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 232.8 273.9 777.5 781.5
Illinois | Natural gas | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 232.8 273.8 777.4 781.4
Illinois | Natural gas | Transferred over time | Total retail revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 199.2 211.0 669.4 653.0
Illinois | Natural gas | Transferred over time | Residential        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 154.1 163.7 508.1 496.3
Illinois | Natural gas | Transferred over time | Commercial and industrial        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 45.1 47.3 161.3 156.7
Illinois | Natural gas | Transferred over time | Transport        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 46.8 54.6 134.0 132.3
Illinois | Natural gas | Transferred over time | Other utility revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers (13.2) 8.2 (26.0) (3.9)
Other States | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 68.2 72.8 257.5 249.4
Other States | Natural gas | Transferred over time        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 64.0 68.9 249.2 241.6
Other States | Natural gas | Transferred over time | Total retail revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 59.8 56.6 257.0 244.5
Other States | Natural gas | Transferred over time | Residential        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 39.3 37.9 164.5 161.1
Other States | Natural gas | Transferred over time | Commercial and industrial        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 20.5 18.7 92.5 83.4
Other States | Natural gas | Transferred over time | Transport        
Disaggregation of Operating Revenues        
Revenues from contracts with customers 6.3 6.8 17.4 16.7
Other States | Natural gas | Transferred over time | Other utility revenues        
Disaggregation of Operating Revenues        
Revenues from contracts with customers $ (2.1) $ 5.5 $ (25.2) $ (19.6)