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Income Taxes (Tables)
 9 Months Ended
Sep. 30, 2012
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 three and nine months ended September 30, 2012 and 2011:

 
Three Months Ended September 30,
 
2012
 
2011
 
 
 
(As revised)
Income (loss) before income taxes
$
126.7

 
$
(34.1
)
Statutory rate
35.0
%
 
35.0
%
Income tax expense (benefit) at federal statutory rate
44.3

 
(11.9
)
Tax effect of:
 
 
 
Dividends received deduction
(1.2
)
 
(25.2
)
Valuation allowance
(10.0
)
 
(73.9
)
IRS audit adjustment
—

 
—

Other
0.3

 
0.1

Income tax expense for three months ended September 30
$
33.4

 
$
(110.9
)
 
 
Nine Months Ended September 30,
 
2012
 
2011
 
 
 
(As revised)
Income (loss) before income taxes
$
403.4

 
$
297.0

Statutory rate
35.0
%
 
35.0
%
Income tax expense (benefit) at federal statutory rate
141.2

 
104.0

Tax effect of:
 
 
 
Dividends received deduction
(13.3
)
 
(31.0
)
Valuation allowance
—

 
(61.0
)
IRS audit adjustment
(0.3
)
 
3.6

Other
0.6

 
0.6

Income tax expense for nine months ended September 30
$
128.2

 
$
16.2