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Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 2013
Summary of Significant Accounting Policies [Abstract]  
Accumulated Other Comprehensive (Loss) Income
Our accumulated other comprehensive income (loss) for the three and nine months ended September 30, 2013 and 2012 is as follows:  
 
Unrealized Gains (Losses) on investments available-for-sale
 
Defined Benefit Pension Plans
 
Accumulated Other Comprehensive Income (loss)
Three Months Ended September 30:
 
 
(Dollars in millions)
 
 
Balance as of July 1, 2012
$
19.6

 
$
(11.9
)
 
$
7.7

Other comprehensive income before reclassifications
22.4

 
—

 
22.4

Amounts reclassified from accumulated other comprehensive income
(2.8
)
 
0.6

 
(2.2
)
Other comprehensive income for the three months ended September 30, 2012
19.6

 
0.6

 
20.2

Balance as of September 30, 2012
$
39.2

 
$
(11.3
)
 
$
27.9

 
 
 
 
 
 
Balance as of July 1, 2013
$
(25.4
)
 
$
(10.2
)
 
$
(35.6
)
Other comprehensive income before reclassifications
0.7

 
—

 
0.7

Amounts reclassified from accumulated other comprehensive income
(0.2
)
 
0.4

 
0.2

Other comprehensive income for the three months ended September 30, 2013
0.5

 
0.4

 
0.9

Balance as of September 30, 2013
$
(24.9
)
 
$
(9.8
)
 
$
(34.7
)
Nine Months Ended September 30:
 
 
 
 
 
Balance as of January 1, 2012
$
29.8

 
$
(13.2
)
 
$
16.6

Other comprehensive income before reclassifications
28.7

 
—

 
28.7

Amounts reclassified from accumulated other comprehensive income
(19.3
)
 
1.9

 
(17.4
)
Other comprehensive income for the nine months ended September 30, 2012
9.4

 
1.9

 
11.3

Balance as of September 30, 2012
$
39.2

 
$
(11.3
)
 
$
27.9

 
 
 
 
 
 
Balance as of January 1, 2013
$
38.0

 
$
(11.0
)
 
$
27.0

Other comprehensive loss before reclassifications
(47.8
)
 
—

 
(47.8
)
Amounts reclassified from accumulated other comprehensive income
(15.1
)
 
1.2

 
(13.9
)
Other comprehensive (loss) income for the nine months ended September 30, 2013
(62.9
)
 
1.2

 
(61.7
)
Balance as of September 30, 2013
$
(24.9
)
 
$
(9.8
)
 
$
(34.7
)
Reclassifications Out of Accumulated Other Comprehensive Income
The following table shows reclassifications out of accumulated other comprehensive income and the affected line items in the consolidated statements of operations for the three and nine months ended September 30, 2013 and 2012:
 
Three months ended September 30,
 
Nine months ended September 30,
Affected line item in the Consolidated Statements of Operations
 
2013
 
2012
 
2013
 
2012
 
 
(Dollars in millions)
 
Unrealized gains on investments available-for-sale
$
0.3

 
$
4.3

 
$
23.3

 
$
29.7

Net investment income
 
0.3

 
4.3

 
23.3

 
29.7

Total before tax
 
0.1

 
1.5

 
8.2

 
10.4

Tax expense
 
0.2

 
2.8

 
15.1

 
19.3

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

 
(0.1
)
 
(0.1
)
(a)
  Actuarial gains (losses)
(0.6
)
 
(1.0
)
 
(1.9
)
 
(3.0
)
(a)
 
(0.7
)
 
(1.0
)
 
(2.0
)
 
(3.1
)
Total before tax
 
(0.3
)
 
(0.4
)
 
(0.8
)
 
(1.2
)
Tax benefit
 
(0.4
)
 
(0.6
)
 
(1.2
)
 
(1.9
)
Net of tax
 
 
 
 
 
 
 
 
 
Total reclassifications for the period
$
(0.2
)
 
$
2.2

 
$
13.9

 
$
17.4

Net of tax
_________
(a)
These accumulated other comprehensive income components are included in the computation of net periodic pension cost.
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, 2012
$
565.9

 
$
565.9

Balance as of September 30, 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 September 30, 2013:
 
 
 
 
 
 
 
Provider networks
$
40.5

 
$
(35.4
)
 
$
5.1

 
19.4
Customer relationships and other
29.5

 
(19.9
)
 
9.6

 
11.1
 
$
70.0

 
$
(55.3
)
 
$
14.7

 
 
 
 
 
 
 
 
 
 
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

2013
$
3.4

2014
2.8

2015
2.6

2016
2.0

2017
2.0