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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2012
Income Tax Disclosure [Abstract]  
Schedule of Components of Income Tax Expense (Benefit)
Significant components of the provision for income taxes from continuing operations are as follows for the years ended December 31:
 
2012
 
2011
 
2010
 
(Dollars in millions)
Current tax expense:
 
 
 
 
 
Federal
$
(3.4
)
 
$
77.8

 
$
58.9

State
(1.2
)
 
14.5

 
12.0

Total current tax expense
(4.6
)
 
92.3

 
70.9

Deferred tax expense (benefit):
 
 
 
 
 
Federal
11.1

 
5.1

 
27.1

State
(2.2
)
 
2.7

 
10.1

Total deferred tax expense (benefit)
8.9

 
7.8

 
37.2

Interest expense, gross of related tax effects
1.7

 
0.6

 
0.6

Total income tax provision
$
6.0

 
$
100.7

 
$
108.7

Schedule of Effective Income Tax Rate Reconciliation
A reconciliation of the statutory federal income tax rate and the effective income tax rate on income from continuing operations is as follows for the years ended December 31:
 
2012
 
2011
 
2010
Statutory federal income tax rate
35.0%
 
35.0%
 
35.0%
State and local taxes, net of federal income tax effect
(6.9)
 
6.9
 
5.2
Valuation allowance (release) against capital losses, net operating losses or tax credits
(26.5)
 
21.9
 
(2.5)
Non-deductible compensation
17.7
 
2.3
 
1.1
Tax exempt interest income
(12.7)
 
(2.2)
 
(1.2)
Sale of subsidiaries
1.8
 
(3.9)
 
(1.2)
Interest expense
5.3
 
0.5
 
0.0
Lobbying expense
3.4
 
0.8
 
0.4
Other, net
1.8
 
1.0
 
1.9
Effective income tax rate
18.9%
 
62.3%
 
38.7%
Schedule of Deferred Tax Assets and Liabilities
Significant components of our deferred tax assets and liabilities as of December 31 are as follows:
 
2012
 
2011
 
(Dollars in millions)
DEFERRED TAX ASSETS:
 
 
 
Accrued liabilities
$
92.7

 
$
71.2

Accrued compensation and benefits
70.5

 
79.6

Net operating and capital loss carryforwards
22.9

 
75.2

Insurance loss reserves and unearned premiums
15.4

 
17.4

Deferred gain and revenues
12.4

 
12.4

Other
2.4

 
0.8

Deferred tax assets before valuation allowance
216.3

 
256.6

Valuation allowance
(19.7
)
 
(63.7
)
Net deferred tax assets
$
196.6

 
$
192.9

 
 
 
 
DEFERRED TAX LIABILITIES:
 
 
 
Depreciable and amortizable property
$
63.6

 
$
51.0

Prepaid expenses
17.7

 
23.4

Unrealized gains on investments
22.9

 
11.6

Deferred revenue
25.8

 
8.3

Other
1.9

 
2.3

Deferred tax liabilities
$
131.9

 
$
96.6

Summary of Income Tax Contingencies
A reconciliation of the beginning and ending amount of unrecognized tax benefits, exclusive of related interest, is as follows:
 
2012
 
2011
 
2010
 
(Dollars in millions)
Gross unrecognized tax benefits at beginning of year
$
47.1

 
$
21.9

 
$
20.9

Increases in unrecognized tax benefits related to the
current year
2.4

 
25.2

 
1.0

Increases in unrecognized tax benefits related to prior years
8.0

 

 

Decreases in unrecognized tax benefits related to a prior year
(0.2
)
 

 

Gross unrecognized tax benefits at end of year
$
57.3

 
$
47.1

 
$
21.9