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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2012
Segment Reporting (Tables) [Abstract]  
Financial information of reportable operating segments
Summarized financial information concerning our reportable segments for each of the three years ended December 31, 2012 is shown in the following table. The segment information below includes income from discontinued operations as a result of the sale of Edison Sault in May 2010.

 
 
Reportable Segments
 
 
 
Eliminations
 
 
 
 
Energy
 
Corporate &
 
& Reconciling
 
Total
Year Ended
 
Utility
 
Non-Utility
 
Other (a)
 
Items
 
Consolidated
 
 
(Millions of Dollars)
December 31, 2012
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
4,190.8

 
$
439.9

 
$
1.2

 
$
(385.5
)
 
$
4,246.4

Depreciation and Amortization
 
$
296.4

 
$
67.1

 
$
0.7

 
$
—

 
$
364.2

Operating Income (Loss)
 
$
647.7

 
$
358.8

 
$
(6.2
)
 
$
—

 
$
1,000.3

Equity in Earnings of Unconsolidated Affiliates
 
$
65.7

 
$
—

 
$
(0.2
)
 
$
—

 
$
65.5

Interest Expense, Net
 
$
129.4

 
$
66.7

 
$
52.5

 
$
(0.4
)
 
$
248.2

Income Tax Expense (Benefit)
 
$
214.9

 
$
116.6

 
$
(25.2
)
 
$
—

 
$
306.3

Income from Discontinued Operations, Net of Tax
 
$
—

 
$
—

 
$
—

 
$
—

 
$
—

Net Income (Loss)
 
$
400.6

 
$
175.9

 
$
546.1

 
$
(576.3
)
 
$
546.3

Capital Expenditures
 
$
697.3

 
$
5.5

 
$
4.2

 
$
—

 
$
707.0

Total Assets (c)
 
$
13,988.1

 
$
2,903.5

 
$
4,431.4

 
$
(7,038.0
)
 
$
14,285.0


December 31, 2011
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
4,431.5

 
$
435.1

 
$
0.9

 
$
(381.1
)
 
$
4,486.4

Depreciation and Amortization
 
$
257.0

 
$
72.5

 
$
0.7

 
$
—

 
$
330.2

Operating Income (Loss)
 
$
544.8

 
$
348.9

 
$
(6.4
)
 
$
—

 
$
887.3

Equity in Earnings of Unconsolidated Affiliates
 
$
62.5

 
$
—

 
$
(0.9
)
 
$
—

 
$
61.6

Interest Expense, Net
 
$
110.0

 
$
66.7

 
$
59.5

 
$
(0.4
)
 
$
235.8

Income Tax Expense (Benefit)
 
$
182.7

 
$
112.8

 
$
(31.6
)
 
$
—

 
$
263.9

Income from Discontinued Operations, Net of Tax
 
$
—

 
$
—

 
$
13.4

 
$
—

 
$
13.4

Net Income (Loss)
 
$
376.3

 
$
169.8

 
$
525.9

 
$
(545.8
)
 
$
526.2

Capital Expenditures
 
$
792.2

 
$
31.2

 
$
7.4

 
$
—

 
$
830.8

Total Assets (c)
 
$
13,433.5

 
$
2,949.0

 
$
4,694.8

 
$
(7,215.2
)
 
$
13,862.1


 
 
Reportable Segments
 
 
 
Eliminations
 
 
 
 
Energy
 
Corporate &
 
& Reconciling
 
Total
Year Ended
 
Utility
 
Non-Utility
 
Other (a)
 
Items
 
Consolidated
 
 
(Millions of Dollars)
December 31, 2010
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
4,165.3

 
$
320.2

 
$
0.5

 
$
(283.5
)
 
$
4,202.5

Depreciation and Amortization
 
$
251.4

 
$
53.5

 
$
0.7

 
$
—

 
$
305.6

Operating Income (Loss)
 
$
564.0

 
$
252.4

 
$
(6.0
)
 
$
—

 
$
810.4

Equity in Earnings of Unconsolidated Affiliates
 
$
60.1

 
$
—

 
$
(0.2
)
 
$
—

 
$
59.9

Interest Expense, Net
 
$
117.2

 
$
40.3

 
$
52.8

 
$
(3.9
)
 
$
206.4

Income Tax Expense (Benefit)
 
$
192.1

 
$
84.9

 
$
(27.1
)
 
$
—

 
$
249.9

Income from Discontinued Operations, Net of Tax
 
$
0.7

 
$
—

 
$
1.4

 
$
—

 
$
2.1

Net Income (Loss)
 
$
354.2

 
$
128.4

 
$
456.4

 
$
(482.5
)
 
$
456.5

Capital Expenditures
 
$
687.0

 
$
109.3

 
$
1.9

 
$
—

 
$
798.2

Total Assets (c)
 
$
11,997.4

 
$
2,914.2

 
$
5,075.9

 
$
(6,927.7
)
 
$
13,059.8


(a)
Corporate & Other includes all other non-utility activities, primarily non-utility real estate investment and development by Wispark as well as interest on corporate debt.

(b)
An elimination for intersegment revenues is included in Operating Revenues. This elimination is primarily between We Power and Wisconsin Electric.

(c)
An elimination of $2,286.7 million, $2,369.0 million and $1,785.9 million is included in Total Assets as of December 31, 2012, 2011 and 2010, respectively, for all PTF-related activity between We Power and Wisconsin Electric.