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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2015
Segment Information [Abstract]  
Financial information of reportable operating segments
 
 
Reportable Segments
 
 
 
Eliminations
 
 
 
 
Energy
 
Corporate &
 
& Reconciling
 
Total
Three Months Ended
 
Utility
 
Non-Utility
 
Other (a)
 
Items
 
Consolidated
 
 
(Millions of Dollars)
June 30, 2015
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
979.9

 
$
115.3

 
$
0.5

 
$
(104.5
)
 
$
991.2

Other Operation and Maintenance
 
$
368.3

 
$
4.7

 
$
68.1

 
$
(104.1
)
 
$
337.0

Depreciation and Amortization
 
$
88.5

 
$
17.1

 
$
0.1

 
$
—

 
$
105.7

Operating Income (Loss)
 
$
140.4

 
$
93.5

 
$
(68.1
)
 
$
—

 
$
165.8

Equity in Earnings of Unconsolidated Affiliates
 
$
14.3

 
$
—

 
$
(0.1
)
 
$
—

 
$
14.2

Interest Expense, Net
 
$
32.4

 
$
15.9

 
$
14.0

 
$
(0.2
)
 
$
62.1

Income Tax Expense (Benefit)
 
$
44.0

 
$
38.4

 
$
(19.2
)
 
$
—

 
$
63.2

Net Income (Loss)
 
$
82.1

 
$
39.5

 
$
82.1

 
$
(122.8
)
 
$
80.9

Capital Expenditures
 
$
201.0

 
$
3.2

 
$
2.8

 
$
—

 
$
207.0

 
 
 
 
 
 
 
 
 
 
 
June 30, 2014
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
1,029.8

 
$
113.4

 
$
0.3

 
$
(99.8
)
 
$
1,043.7

Other Operation and Maintenance
 
$
343.6

 
$
5.0

 
$
6.1

 
$
(98.7
)
 
$
256.0

Depreciation and Amortization
 
$
84.3

 
$
16.7

 
$
0.4

 
$
—

 
$
101.4

Operating Income (Loss)
 
$
155.2

 
$
91.7

 
$
(6.2
)
 
$
—

 
$
240.7

Equity in Earnings of Unconsolidated Affiliates
 
$
17.5

 
$
—

 
$
—

 
$
—

 
$
17.5

Interest Expense, Net
 
$
30.7

 
$
16.2

 
$
12.2

 
$
(0.1
)
 
$
59.0

Income Tax Expense (Benefit)
 
$
51.4

 
$
30.2

 
$
(7.3
)
 
$
—

 
$
74.3

Net Income (Loss)
 
$
96.3

 
$
45.4

 
$
132.9

 
$
(141.6
)
 
$
133.0

Capital Expenditures
 
$
172.6

 
$
4.6

 
$
(0.9
)
 
$
—

 
$
176.3

 
 
Reportable Segments
 
 
 
Eliminations
 
 
 
 
Energy
 
Corporate &
 
& Reconciling
 
Total
Six Months Ended
 
Utility
 
Non-Utility
 
Other (a)
 
Items
 
Consolidated
 
 
(Millions of Dollars)
June 30, 2015
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
2,356.8

 
$
225.0

 
$
0.8

 
$
(203.5
)
 
$
2,379.1

Other Operation and Maintenance
 
$
737.4

 
$
5.8

 
$
77.5

 
$
(203.0
)
 
$
617.7

Depreciation and Amortization
 
$
176.4

 
$
34.1

 
$
0.3

 
$
—

 
$
210.8

Operating Income (Loss)
 
$
416.9

 
$
185.1

 
$
(77.4
)
 
$
—

 
$
524.6

Equity in Earnings of Unconsolidated Affiliates
 
$
30.4

 
$
—

 
$
(0.1
)
 
$
—

 
$
30.3

Interest Expense, Net
 
$
64.1

 
$
31.8

 
$
26.2

 
$
(0.3
)
 
$
121.8

Income Tax Expense (Benefit)
 
$
141.8

 
$
69.0

 
$
(25.2
)
 
$
—

 
$
185.6

Net Income (Loss)
 
$
247.2

 
$
84.7

 
$
279.1

 
$
(334.3
)
 
$
276.7

Capital Expenditures
 
$
345.2

 
$
7.2

 
$
4.1

 
$
—

 
$
356.5

 
 
 
 
 
 
 
 
 
 
 
June 30, 2014
 
 
 
 
 
 
 
 
 
 
Operating Revenues (b)
 
$
2,711.9

 
$
221.7

 
$
0.6

 
$
(195.5
)
 
$
2,738.7

Other Operation and Maintenance
 
$
711.2

 
$
6.2

 
$
7.3

 
$
(193.3
)
 
$
531.4

Depreciation and Amortization
 
$
167.9

 
$
33.6

 
$
0.5

 
$
—

 
$
202.0

Operating Income (Loss)
 
$
447.9

 
$
181.9

 
$
(7.3
)
 
$
—

 
$
622.5

Equity in Earnings of Unconsolidated Affiliates
 
$
34.8

 
$
—

 
$
—

 
$
—

 
$
34.8

Interest Expense, Net
 
$
64.7

 
$
32.5

 
$
24.4

 
$
(0.3
)
 
$
121.3

Income Tax Expense (Benefit)
 
$
158.8

 
$
60.2

 
$
(14.4
)
 
$
—

 
$
204.6

Net Income (Loss)
 
$
265.7

 
$
89.5

 
$
340.4

 
$
(355.0
)
 
$
340.6

Capital Expenditures
 
$
293.3

 
$
9.7

 
$
2.5

 
$
—

 
$
305.5

 
 
 
 
 
 
 
 
 
 
 
(a)
Corporate & Other includes all other non-utility activities, primarily non-utility real estate investment and development by Wispark LLC, 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.