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Income Taxes (Tables)
 6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation
Income taxes were different from the amount computed by applying the federal income tax rate to income (loss) before income taxes for the following reasons for the periods indicated:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
Income (loss) before income taxes
$
103.0

 
$
112.8

 
$
164.7

 
$
219.7

Tax rate
35.0
%
 
35.0
%
 
35.0
%
 
35.0
%
Income tax expense (benefit) at federal statutory rate
36.1

 
39.5

 
57.6

 
76.9

Tax effect of:
 
 
 
 
 
 
 
Dividends received deduction
(7.9
)
 
(6.3
)
 
(13.9
)
 
(11.6
)
Valuation allowance
—

 
1.9

 
—

 
1.9

IRS audit adjustment
—

 
—

 
(0.1
)
 
(0.3
)
Other
0.2

 
0.8

 
0.8

 
0.8

Income tax expense (benefit)
$
28.4

 
$
35.9

 
$
44.4

 
$
67.7