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Quarterly Financial Data (Tables)
 12 Months Ended
Dec. 31, 2018
Quarterly Financial Data [Abstract]  
Schedule Of Quarterly Financial Data
(in millions, except per share data)
First
Quarter(1)
 
Second
Quarter(2)
 
Third
   Quarter(3)
 
Fourth
Quarter(4)
2018
 
 
 
 
 
 
 
Operating Revenues
$
1,750.8

 
$
1,007.0

 
$
895.0

 
$
1,461.7

Operating Income (Loss)
400.6

 
118.4

 
(315.9
)
 
(78.4
)
Net Income (Loss)
276.1

 
24.5

 
(339.5
)
 
(11.7
)
Preferred Dividends
—

 
(1.3
)
 
(5.6
)
 
(8.1
)
Net Income (Loss) Available to Common Shareholders
276.1

 
23.2

 
(345.1
)
 
(19.8
)
Earnings (Loss) Per Share
 
 
 
 
 
 
 
Basic Earnings (Loss) Per Share
$
0.82

 
$
0.07

 
$
(0.95
)
 
$
(0.05
)
Diluted Earnings (Loss) Per Share
$
0.81

 
$
0.07

 
$
(0.95
)
 
$
(0.05
)
2017
 
 
 
 
 
 
 
Operating Revenues
$
1,598.6

 
$
990.7

 
$
917.0

 
$
1,368.3

Operating Income
415.4

 
124.0

 
111.2

 
270.6

Net Income (Loss)
211.3

 
(44.4
)
 
14.0

 
(52.4
)
Earnings (Loss) Per Share
 
 
 
 
 
 
 
Basic Earnings (Loss) Per Share
$
0.65

 
$
(0.14
)
 
$
0.04

 
$
(0.16
)
Diluted Earnings (Loss) Per Share
$
0.65

 
$
(0.14
)
 
$
0.04

 
$
(0.16
)

(1) Net income for the first quarter of 2018 was impacted by an interest rate swap settlement gain of $21.2 million (pretax). See Note 9, "Risk Management Activities" for additional information.
(2) Net income for the second quarter of 2017 was impacted by a $111.5 million loss (pretax) on an early extinguishment of long-term debt. See Note 14, "Long-Term Debt" for additional information.
(3) Net income for the third quarter of 2018 was impacted by approximately $462 million in expenses (pretax) related to the Greater Lawrence Incident restoration and a $33.0 million loss (pretax) on an early extinguishment of long-term debt. See Note 18-E, "Other Matters" and Note 14, "Long-Term Debt" for additional information.
(4) Net income for the fourth quarter of 2018 was impacted by approximately $426 million in expenses (pretax, net of insurance recoveries) related to the Greater Lawrence Incident restoration, partially offset by an interest rate swap settlement gain of $25.0 million (pretax) and a $120.7 million income tax benefit from true-ups to reflect regulatory outcomes associated with excess deferred income taxes. Net income for the fourth quarter of 2017 was impacted by a $161.1 million increase in tax expense as a result of implementing the provisions of the TCJA. See Note 18-E, "Other Matters," Note 9, "Risk Management Activities" and Note 10, "Income Taxes" for additional information.