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Report of Business Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Segment Reporting Information [Line Items]              
Operating revenues $ 503.5   $ 513.7   $ 934.8 $ 1,003.7  
Cost of sales 137.4   178.7   272.4 391.3  
Other operation and maintenance 117.5   119.8   237.5 238.8  
Depreciation and amortization 97.3   84.3   191.7 166.7  
Taxes other than income 25.9   20.9   51.5 47.2  
OPERATING INCOME 125.4   110.0   181.7 159.7  
Equity in earnings of unconsolidated affiliates 26.9   35.8   (719.6) [1] 66.5  
Other income 2.0   1.5   4.1 (3.0)  
Interest expense 40.8   35.9   79.1 70.5  
Income tax expense 27.6   11.2   (207.0) 5.4  
Net income (loss) 85.9 $ (491.8) 100.2 $ 47.1 (405.9) 147.3  
Investment in unconsolidated affiliates 376.5   1,171.3   376.5 1,171.3 $ 1,151.5
Total assets 10,439.1   10,886.2   10,439.1 10,886.2 $ 11,024.3
Electric Utility [Member]              
Segment Reporting Information [Line Items]              
Operating revenues 503.5   513.7   934.8 1,003.7  
Cost of sales 137.4   178.7   272.4 391.3  
Other operation and maintenance 117.7   120.0   238.7 240.3  
Depreciation and amortization 97.3   84.3   191.7 166.7  
Taxes other than income 25.0   20.1   48.9 44.5  
OPERATING INCOME 126.1   110.6   183.1 160.9  
Equity in earnings of unconsolidated affiliates 0.0   0.0   0.0 [1] 0.0  
Other income 0.5   1.5   2.3 4.1  
Interest expense 39.3   33.3   76.2 65.7  
Income tax expense 8.4   4.3   10.4 5.2  
Net income (loss) 78.9   74.5   98.8 94.1  
Investment in unconsolidated affiliates 0.0   0.0   0.0 0.0  
Total assets 10,367.6   9,733.8   10,367.6 9,733.8  
Natural Gas Midstream Operations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues 0.0   0.0   0.0 0.0  
Cost of sales 0.0   0.0   0.0 0.0  
Other operation and maintenance 0.3   0.3   0.9 0.7  
Depreciation and amortization 0.0   0.0   0.0 0.0  
Taxes other than income 0.1   0.1   0.2 0.3  
OPERATING INCOME (0.4)   (0.4)   (1.1) (1.0)  
Equity in earnings of unconsolidated affiliates 26.9   35.8   (719.6) [1] 66.5  
Other income 0.0   (0.4)   0.0 (7.8)  
Interest expense 0.0   0.0   0.0 0.0  
Income tax expense 7.5   8.1   (171.7) 9.5  
Net income (loss) 19.0   26.9   (549.0) 48.2  
Investment in unconsolidated affiliates 356.4   1,157.2   356.4 1,157.2  
Total assets 360.2   1,160.0   360.2 1,160.0  
Other Operations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues 0.0   0.0   0.0 0.0  
Cost of sales 0.0   0.0   0.0 0.0  
Other operation and maintenance (0.5)   (0.5)   (2.1) (2.2)  
Depreciation and amortization 0.0   0.0   0.0 0.0  
Taxes other than income 0.8   0.7   2.4 2.4  
OPERATING INCOME (0.3)   (0.2)   (0.3) (0.2)  
Equity in earnings of unconsolidated affiliates 0.0   0.0   0.0 [1] 0.0  
Other income 1.7   1.0   3.0 1.7  
Interest expense 1.7   3.2   4.1 5.8  
Income tax expense 11.7   (1.2)   (45.7) (9.3)  
Net income (loss) (12.0)   (1.2)   44.3 5.0  
Investment in unconsolidated affiliates 20.1   14.1   20.1 14.1  
Total assets 109.1   104.5   109.1 104.5  
Eliminations [Member]              
Segment Reporting Information [Line Items]              
Operating revenues 0.0   0.0   0.0 0.0  
Cost of sales 0.0   0.0   0.0 0.0  
Other operation and maintenance 0.0   0.0   0.0 0.0  
Depreciation and amortization 0.0   0.0   0.0 0.0  
Taxes other than income 0.0   0.0   0.0 0.0  
OPERATING INCOME 0.0   0.0   0.0 0.0  
Equity in earnings of unconsolidated affiliates 0.0   0.0   0.0 [1] 0.0  
Other income (0.2)   (0.6)   (1.2) (1.0)  
Interest expense (0.2)   (0.6)   (1.2) (1.0)  
Income tax expense 0.0   0.0   0.0 0.0  
Net income (loss) 0.0   0.0   0.0 0.0  
Investment in unconsolidated affiliates 0.0   0.0   0.0 0.0  
Total assets $ (397.8)   $ (112.1)   $ (397.8) $ (112.1)  
[1] In March 2020, the Company recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 4 and 5.