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Report of Business Segments (Tables)
9 Months Ended
Sep. 30, 2020
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment [Table Text Block] The following tables summarize the results of the Company's business segments during the three and nine months ended September 30, 2020 and 2019.
Three Months Ended September 30, 2020Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$702.1 $ $ $ $702.1 
Cost of sales209.1    209.1 
Other operation and maintenance110.1 0.3 (0.7) 109.7 
Depreciation and amortization100.5    100.5 
Taxes other than income23.9 0.2 0.7  24.8 
Operating income (loss)258.5 (0.5)  258.0 
Equity in earnings of unconsolidated affiliates 15.8   15.8 
Other income (expense)0.6 (0.7)(0.5)(0.2)(0.8)
Interest expense39.5  0.5 (0.2)39.8 
Income tax expense20.1 4.5 31.2  55.8 
Net income (loss)$199.5 $10.1 $(32.2)$ $177.4 
Investment in unconsolidated affiliates$ $355.8 $21.0 $ $376.8 
Total assets$10,323.3 $358.7 $109.6 $(294.0)$10,497.6 

Three Months Ended September 30, 2019Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$755.4 $— $— $— $755.4 
Cost of sales234.0 — — — 234.0 
Other operation and maintenance130.0 0.6 (0.8)— 129.8 
Depreciation and amortization94.1 — — — 94.1 
Taxes other than income22.3 0.1 0.8 — 23.2 
Operating income (loss)275.0 (0.7)— — 274.3 
Equity in earnings of unconsolidated affiliates— 38.3 — — 38.3 
Other income (expense)(0.1)(0.6)0.6 (1.2)(1.3)
Interest expense38.0 — 2.8 (1.2)39.6 
Income tax expense9.7 8.5 2.6 — 20.8 
Net income (loss)$227.2 $28.5 $(4.8)$— $250.9 
Investment in unconsolidated affiliates$— $1,159.1 $16.8 $— $1,175.9 
Total assets$10,019.7 $1,161.5 $108.3 $(205.8)$11,083.7 
Nine Months Ended September 30, 2020Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$1,636.9 $ $ $ $1,636.9 
Cost of sales481.5    481.5 
Other operation and maintenance348.8 1.2 (2.8) 347.2 
Depreciation and amortization292.2    292.2 
Taxes other than income72.8 0.4 3.1  76.3 
Operating income (loss)441.6 (1.6)(0.3) 439.7 
Equity in losses of unconsolidated affiliates (A) (703.8)  (703.8)
Other income (expense)2.9 (0.7)2.5 (1.4)3.3 
Interest expense115.7  4.6 (1.4)118.9 
Income tax expense (benefit)30.5 (167.2)(14.5) (151.2)
Net income (loss)$298.3 $(538.9)$12.1 $ $(228.5)
Investment in unconsolidated affiliates$ $355.8 $21.0 $ $376.8 
Total assets$10,323.3 $358.7 $109.6 $(294.0)$10,497.6 
(A)In March 2020, the Company recorded a $780.0 million impairment on its investment in Enable, as further discussed in Notes 4 and 5.

Nine Months Ended September 30, 2019Electric UtilityNatural Gas Midstream OperationsOther
Operations
EliminationsTotal
(In millions)     
Operating revenues$1,759.1 $— $— $— $1,759.1 
Cost of sales625.3 — — — 625.3 
Other operation and maintenance370.3 1.3 (3.0)— 368.6 
Depreciation and amortization260.8 — — — 260.8 
Taxes other than income66.8 0.4 3.2 — 70.4 
Operating income (loss)435.9 (1.7)(0.2)— 434.0 
Equity in earnings of unconsolidated affiliates— 104.8 — — 104.8 
Other income (expense)4.0 (8.4)2.3 (2.2)(4.3)
Interest expense103.7 — 8.6 (2.2)110.1 
Income tax expense (benefit)14.9 18.0 (6.7)— 26.2 
Net income$321.3 $76.7 $0.2 $— $398.2 
Investment in unconsolidated affiliates$— $1,159.1 $16.8 $— $1,175.9 
Total assets$10,019.7 $1,161.5 $108.3 $(205.8)$11,083.7