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Income Taxes (Tables)
 3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Reconciliation Between Actual Federal Income Tax Benefit and Amount Computed at Indicated Statutory Rate
The following table sets forth the reconciliation between actual federal income tax expense and the amount computed at the indicated statutory rate for the three months ended March 31, 2015 and 2014:
($ millions)
2015
 
2014
Amount at statutory rate
$
11.6

 
35
 %
 
$
9.7

 
35
 %
Tax-exempt interest and dividends received deduction
(2.2
)
 
(7
)
 
(2.1
)
 
(8
)
Other, net
(0.9
)
 
(3
)
 
0.2

 
1

Valuation allowance
—

 
—

 
(7.2
)
 
(26
)
Federal income tax expense and effective rate
$
8.5

 
25
 %
 
$
0.6

 
2
 %