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Income Tax Expense (Tables)
3 Months Ended
Mar. 31, 2016
Income Tax Disclosure [Abstract]  
Income Tax Expense [Table Text Block]
 
 
Three Months Ended
 
 
March 31,
 
 
2016
 
2015
Millions
 
 
 
 
Current Tax Expense (a)
 
 
 
 
Federal
 

 

State
 

$0.1

 
$0.1
Total Current Tax Expense
 

$0.1

 
$0.1
Deferred Tax Expense (Benefit)
 
 
 
 
Federal
 
$4.6
 

$4.8

State
 
4.8

 
1.5

Investment Tax Credit Amortization
 
(0.2
)
 
(0.2
)
Total Deferred Tax Expense
 
$9.2
 

$6.1

Total Income Tax Expense
 
$9.3
 

$6.2


(a)
For the three months ended March 31, 2016 and 2015, the federal and state current tax expense was minimal due to NOLs which resulted from the bonus depreciation provisions of the Protecting Americans from Tax Hikes Act of 2015, the Tax Increase Prevention Act of 2014 and the American Taxpayer Relief Act of 2012.

Reconciliation of Taxes from Federal Statutory Rate to Total Income Tax Expense [Table Text Block]
Reconciliation of Taxes from Federal Statutory
 
 
Rate to Total Income Tax Expense
 
 
Three Months Ended March 31
2016

2015

Millions
 
 
Income Before Non-Controlling Interest and Income Taxes

$55.7


$46.3

Statutory Federal Income Tax Rate
35
%
35
%
Income Taxes Computed at 35 percent Statutory Federal Rate
19.5

16.2

Increase (Decrease) in Tax Due to:
 
 
State Income Taxes – Net of Federal Income Tax Benefit
3.2

1.0

Production Tax Credits
(13.9
)
(12.8
)
Regulatory Differences for Utility Plant
(0.1
)
(0.4
)
Other
0.6

2.2

Total Income Tax Expense

$9.3


$6.2