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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]  
Carrying Amount Of Goodwill
The carrying amount of goodwill by reporting unit is as follows:
 
Western
Region
Operations 
 
Total
 
(Dollars in millions)
Balance as of December 31, 2011
$
605.9

 
$
605.9

Goodwill allocated to Medicare PDP business sold
(40.0
)
 
(40.0
)
Balance as of December 31, 2012
565.9

 
565.9

Balance as of December 31, 2013
$
565.9

 
$
565.9
Schedule Of Intangible Assets
The intangible assets that continue to be subject to amortization using the straight-line method over their estimated lives are as follows:
 
Gross
Carrying
Amount  
 
Accumulated
Amortization  
 
Net
Balance  
 
Weighted
Average Life
(in years)  
 
(Dollars in millions)
 
 
As of December 31, 2013:
 
 
 
 
 
 
 
Provider networks
$
40.5

 
$
(35.7
)
 
$
4.8

 
19.4
Customer relationships and other
29.5

 
(20.5
)
 
9.0

 
11.1
 
$
70.0

 
$
(56.2
)
 
$
13.8

 
 
 
 
 
 
 
 
 
 
As of December 31, 2012:
 
 
 
 
 
 
 
Provider networks
$
40.5

 
$
(34.6
)
 
$
5.9

 
19.4
Customer relationships and other
29.5

 
(18.1
)
 
11.4

 
11.1
 
$
70.0

 
$
(52.7
)
 
$
17.3

 
 
Estimated Annual Pretax Amortization Expense For Other Intangible Assets
 Estimated annual pretax amortization expense for other intangible assets for each of the next five years ending December 31 is as follows (dollars in millions):  
Year
Amount
2014
$
2.8

2015
2.6

2016
2.0

2017
2.0

2018
2.0
Accumulated Other Comprehensive (Loss) Income
Our accumulated other comprehensive income (loss) for the years ended December 31, 2013, 2012 and 2011 is as follows:
 
Unrealized Gains (Losses) on investments available-for-sale
 
Defined Benefit Pension Plans
 
Accumulated Other Comprehensive Income (loss)
 
 
 
(Dollars in millions)
 
 
Balance as of January 1, 2011
$
5.3

 
$
(4.8
)
 
$
0.5

Other comprehensive income (loss) before reclassifications
46.0

 
(8.7
)
 
37.3

Amounts reclassified from accumulated other comprehensive income
(21.5
)
 
0.3

 
(21.2
)
Other comprehensive income (loss) for the year ended December 31, 2011
24.5

 
(8.4
)
 
16.1

Balance as of January 1, 2012
$
29.8

 
$
(13.2
)
 
$
16.6

Other comprehensive income (loss) before reclassifications
32.1

 
(0.4
)
 
31.7

Amounts reclassified from accumulated other comprehensive income
(23.9
)
 
2.6

 
(21.3
)
Other comprehensive income for the year ended December 31, 2012
8.2

 
2.2

 
10.4

Balance as of January 1, 2013
$
38.0

 
$
(11.0
)
 
$
27.0

Other comprehensive income (loss) before reclassifications
(50.7
)
 
4.8

 
(45.9
)
Amounts reclassified from accumulated other comprehensive income
(15.6
)
 
1.6

 
(14.0
)
Other comprehensive (loss) income for the year ended December 31, 2013
(66.3
)
 
6.4

 
(59.9
)
Balance as of December 31, 2013
$
(28.3
)
 
$
(4.6
)
 
$
(32.9
)
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table shows reclassifications out of accumulated other comprehensive income and the affected line items in the consolidated statements of operations for the years ended December 31, 2013, 2012 and 2011:
 
Year Ended December 31,
 
Affected line item in the Consolidated Statements of Operations
 
2013
 
2012
 
2011
 
 
 
(Dollars in millions)
 
 
Unrealized gains on investments available-for-sale
$
24.0

 
$
36.7

 
$
33.0

 
Net investment income
 
24.0

 
36.7

 
33.0

 
Total before tax
 
8.4

 
12.8

 
11.5

 
Tax expense
 
15.6

 
23.9

 
21.5

 
Net of tax
Amortization of defined benefit pension items:
 
 
 
 
 
 
 
      Prior-service cost
(0.1
)
 
(0.1
)
 
—

 
(a)
  Actuarial gains (losses)
(2.5
)
 
(4.1
)
 
(0.6
)
 
(a)
 
(2.6
)
 
(4.2
)
 
(0.6
)
 
Total before tax
 
(1.0
)
 
(1.6
)
 
(0.3
)
 
Tax benefit
 
(1.6
)
 
(2.6
)
 
(0.3
)
 
Net of tax
 
 
 
 
 
 
 
 
Total reclassifications for the period
$
14.0

 
$
21.3

 
$
21.2

 
Net of tax
_________
(a)
These accumulated other comprehensive income components are included in the computation of net periodic pension cost.