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Segment Reporting (Tables)
 12 Months Ended
Dec. 31, 2014
Segment Reporting [Abstract]  
Financial information of reportable operating segments
Summarized financial information concerning our reportable segments for each of the three years ended December 31, 2014 is shown in the following table.

 
 
Reportable Segments
 
 
 
Eliminations
 
 
 
 
Energy
 
Corporate &
 
& Reconciling
 
Total
Year Ended
 
Utility
 
Non-Utility
 
Other (a)
 
Items
 
Consolidated
 
 
(Millions of Dollars)
December 31, 2014
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
4,941.3

 
$
447.1

 
$
1.3

 
$
(392.6
)
 
$
4,997.1

Depreciation and Amortization
 
$
340.6

 
$
67.5

 
$
0.7

 
$
—

 
$
408.8

Operating Income (Loss)
 
$
770.2

 
$
368.2

 
$
(26.3
)
 
$
—

 
$
1,112.1

Equity in Earnings of Unconsolidated Affiliates
 
$
66.0

 
$
—

 
$
(0.1
)
 
$
—

 
$
65.9

Interest Expense, Net
 
$
128.8

 
$
64.6

 
$
48.8

 
$
(0.7
)
 
$
241.5

Income Tax Expense (Benefit)
 
$
268.9

 
$
121.4

 
$
(28.6
)
 
$
—

 
$
361.7

Net Income (Loss)
 
$
447.2

 
$
182.8

 
$
588.0

 
$
(629.7
)
 
$
588.3

Capital Expenditures
 
$
689.9

 
$
41.1

 
$
5.1

 
$
—

 
$
736.1

Total Assets (c)
 
$
14,912.8

 
$
2,821.8

 
$
4,880.3

 
$
(7,451.5
)
 
$
15,163.4


December 31, 2013
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
4,462.0

 
$
446.7

 
$
1.3

 
$
(391.0
)
 
$
4,519.0

Depreciation and Amortization
 
$
320.2

 
$
67.1

 
$
0.8

 
$
—

 
$
388.1

Operating Income (Loss)
 
$
719.4

 
$
367.1

 
$
(6.4
)
 
$
—

 
$
1,080.1

Equity in Earnings of Unconsolidated Affiliates
 
$
68.5

 
$
—

 
$
(0.1
)
 
$
—

 
$
68.4

Interest Expense, Net
 
$
136.2

 
$
65.7

 
$
50.8

 
$
(0.6
)
 
$
252.1

Income Tax Expense (Benefit)
 
$
243.6

 
$
120.2

 
$
(25.9
)
 
$
—

 
$
337.9

Net Income (Loss)
 
$
425.1

 
$
181.6

 
$
577.2

 
$
(606.5
)
 
$
577.4

Capital Expenditures
 
$
657.9

 
$
26.1

 
$
3.4

 
$
—

 
$
687.4

Total Assets (c)
 
$
14,460.4

 
$
2,846.5

 
$
4,719.5

 
$
(7,257.0
)
 
$
14,769.4


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

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


(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 $2,172.9 million, $2,231.2 million and $2,286.7 million is included in Total Assets as of December 31, 2014, 2013 and 2012, respectively, for all PTF-related activity between We Power and Wisconsin Electric.