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Segment Information (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Jun. 29, 2015
Segment information                        
Document Period End Date                 Dec. 31, 2016      
Number of reportable segments | segment                 6      
Revenues $ 1,963.0 $ 1,712.5 $ 1,602.0 $ 2,194.8 $ 1,848.3 $ 1,698.7 $ 991.2 $ 1,387.9 $ 7,472.3 $ 5,926.1 $ 4,997.1  
Other operation and maintenance                 2,185.5 1,709.3 1,112.4  
Depreciation and amortization                 762.6 561.8 391.4  
Operating income (loss) 361.7 $ 399.0 $ 332.1 $ 589.3 380.2 $ 345.7 $ 165.8 $ 358.8 1,682.1 1,250.5 1,112.1  
Equity in earnings of transmission affiliate                 146.5 96.1 66.0  
Interest expense                 402.7 331.4 240.3  
Capital expenditures                 1,423.7 1,266.2 761.2  
Total assets 30,123.2       29,355.2       30,123.2 29,355.2 14,905.0  
Intersegment revenues                        
Segment information                        
Revenues                 0.0 0.0 0.0  
We Power                        
Segment information                        
Revenues                 24.9 40.0 55.7  
Other operation and maintenance                 4.3 4.3 4.4  
Depreciation and amortization                 68.3 67.5 66.7  
Operating income (loss)                 375.6 373.4 368.0  
Equity in earnings of transmission affiliate                 0.0 0.0 0.0  
Interest expense                 62.1 63.4 64.6  
Capital expenditures                 62.3 53.4 41.0  
Total assets 2,777.1       2,779.0       2,777.1 2,779.0 2,789.9  
We Power | Intersegment revenues                        
Segment information                        
Revenues                 423.3 405.2 383.4  
Corporate and other                        
Segment information                        
Revenues                 23.3 47.3 9.3  
Other operation and maintenance                 (15.8) 103.7 33.0  
Depreciation and amortization                 42.6 12.4 1.5  
Operating income (loss)                 (10.0) (91.2) (26.1)  
Equity in earnings of transmission affiliate                 0.0 0.0 0.0  
Interest expense                 120.9 91.0 48.8  
Capital expenditures                 97.8 33.4 5.2  
Total assets 778.0       1,132.5       778.0 1,132.5 253.3  
Corporate and other | Intersegment revenues                        
Segment information                        
Revenues                 0.0 0.0 0.0  
Reconciling eliminations                        
Segment information                        
Revenues                 0.0 0.0 0.0  
Other operation and maintenance                 (423.6) (409.3) (387.7)  
Depreciation and amortization                 0.0 0.0 0.0  
Operating income (loss)                 0.0 0.0 0.0  
Equity in earnings of transmission affiliate                 0.0 0.0 0.0  
Interest expense                 (8.6) (5.1) (0.7)  
Capital expenditures                 0.0 0.0 0.0  
Total assets (3,349.2)       (3,431.7)       (3,349.2) (3,431.7) (2,966.1)  
Reconciling eliminations | WE                        
Segment information                        
Total assets 2,029.5       2,105.3       2,029.5 2,105.3 2,172.9  
Reconciling eliminations | Intersegment revenues                        
Segment information                        
Revenues                 (423.6) (410.2) (392.6)  
Regulated operations                        
Segment information                        
Revenues                 7,424.1 5,838.8 4,932.1  
Other operation and maintenance                 2,620.6 2,010.6 1,462.7  
Depreciation and amortization                 651.7 481.9 323.2  
Operating income (loss)                 1,316.5 968.3 770.2  
Equity in earnings of transmission affiliate                 146.5 96.1 66.0  
Interest expense                 228.3 182.1 127.6  
Capital expenditures                 1,263.6 1,179.4 715.0  
Total assets 29,917.3       28,875.4       29,917.3 28,875.4 14,827.9  
Regulated operations | Intersegment revenues                        
Segment information                        
Revenues                 0.3 5.0 9.2  
Regulated operations | Wisconsin                        
Segment information                        
Revenues                 5,805.4 5,186.1 4,932.1  
Other operation and maintenance                 2,025.4 1,741.0 1,462.7  
Depreciation and amortization                 496.6 408.6 323.2  
Operating income (loss)                 1,027.0 884.2 770.2  
Equity in earnings of transmission affiliate                 0.0 0.0 0.0  
Interest expense                 180.9 157.1 127.6  
Capital expenditures                 910.9 950.3 715.0  
Total assets 21,730.7       21,113.5       21,730.7 21,113.5 14,403.8  
Regulated operations | Wisconsin | Intersegment revenues                        
Segment information                        
Revenues                 0.3 5.0 9.2  
Regulated operations | Illinois                        
Segment information                        
Revenues                 1,242.2 503.4 0.0  
Other operation and maintenance                 485.1 219.6 0.0  
Depreciation and amortization                 134.0 63.3 0.0  
Operating income (loss)                 239.6 78.1 0.0  
Equity in earnings of transmission affiliate                 0.0 0.0 0.0  
Interest expense                 38.9 19.9 0.0  
Capital expenditures                 293.2 194.4 0.0  
Total assets 5,714.6       5,462.9       5,714.6 5,462.9 0.0  
Regulated operations | Illinois | Intersegment revenues                        
Segment information                        
Revenues                 0.0 0.0 0.0  
Regulated operations | Other States                        
Segment information                        
Revenues                 376.5 149.3 0.0  
Other operation and maintenance                 110.1 50.0 0.0  
Depreciation and amortization                 21.1 10.0 0.0  
Operating income (loss)                 49.9 6.0 0.0  
Equity in earnings of transmission affiliate                 0.0 0.0 0.0  
Interest expense                 8.5 5.1 0.0  
Capital expenditures                 59.5 34.7 0.0  
Total assets 995.1       918.0       995.1 918.0 0.0  
Regulated operations | Other States | Intersegment revenues                        
Segment information                        
Revenues                 0.0 0.0 0.0  
Regulated operations | Electric transmission                        
Segment information                        
Revenues                 0.0 0.0 0.0  
Other operation and maintenance                 0.0 0.0 0.0  
Depreciation and amortization                 0.0 0.0 0.0  
Operating income (loss)                 0.0 0.0 0.0  
Equity in earnings of transmission affiliate                 146.5 96.1 66.0  
Interest expense                 0.0 0.0 0.0  
Capital expenditures                 0.0 0.0 0.0  
Total assets $ 1,476.9       $ 1,381.0       1,476.9 1,381.0 424.1  
Regulated operations | Electric transmission | Intersegment revenues                        
Segment information                        
Revenues                 $ 0.0 0.0 0.0  
ATC                        
Segment information                        
Equity method investment, ownership interest (as a percent) 60.00%               60.00%     26.20%
Equity in earnings of transmission affiliate                 $ 146.5 $ 96.1 $ 66.0