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Income Tax Expense (Tables)
6 Months Ended
Jun. 30, 2014
Income Tax Expense [Abstract]  
Income Tax Expense [Table Text Block]
 
 
Quarter Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2014
 
2013
 
2014
 
2013
Millions
 
 
 
 
 
 
 
 
Current Tax Expense (Benefit)
 
 
 
 
 
 
 
 
Federal (a)
 

 
$(0.2)
 

 

State (a)
 
$0.1
 

 
$0.1
 

Total Current Tax Expense (Benefit)
 
$0.1
 
$(0.2)
 
$0.1
 

Deferred Tax Expense (Benefit)
 
 
 
 
 
 
 
 
Federal
 

$2.9

 

$3.6

 

$9.2

 

$8.2

State
 
2.0

 
0.9

 
4.7

 
3.8

Investment Tax Credit Amortization
 
(0.1
)
 
(0.2
)
 
(0.3
)
 
(0.4
)
Total Deferred Tax Expense
 
4.8

 
4.3

 
13.6

 
11.6

Total Income Tax Expense
 

$4.9

 

$4.1

 

$13.7

 

$11.6

(a)
For the quarter and six months ended June 30, 2014, the federal and state current tax expense reflected the utilization of NOL carryforwards from prior periods. The federal and state NOLs remaining after utilization in 2014 will be carried forward to offset future taxable income. For the quarter and six months ended June 30, 2013, the federal and state current tax benefit was due to federal and state NOLs which resulted from the bonus depreciation provision of the American Taxpayer Relief Act of 2012.