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Investments (Tables)
 9 Months Ended
Sep. 30, 2013
Investments [Abstract]  
Fair Value of Investments Available-for-Sale
As of September 30, 2013 and December 31, 2012, the amortized cost, gross unrealized holding gains and losses, and fair value of our current investments available-for-sale and our investments available-for-sale-noncurrent, after giving effect to other-than-temporary impairments, were as follows:   
 
 
September 30, 2013
 
 
Amortized
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Carrying
Value
 
 
(Dollars in millions)
Current:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
410.1

 
$
3.9

 
$
(6.6
)
 
$
407.4

U.S. government and agencies
 
26.5

 
—

 
—

 
26.5

Obligations of states and other political subdivisions
 
741.1

 
6.4

 
(28.3
)
 
719.2

Corporate debt securities
 
433.4

 
3.3

 
(9.8
)
 
426.9

 
 
$
1,611.1

 
$
13.6

 
$
(44.7
)
 
$
1,580.0

Noncurrent:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
0.8

 
$
—

 
$
(0.1
)
 
$
0.7

Obligations of states and other political subdivisions
 
48.9

 
—

 
(6.0
)
 
42.9

Corporate debt securities
 
10.4

 
—

 
(1.4
)
 
9.0

 
 
$
60.1

 
$
—

 
$
(7.5
)
 
$
52.6

 
 
December 31, 2012
 
 
Amortized
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Carrying
Value
 
 
(Dollars in millions)
Current:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
499.7

 
$
19.6

 
$
(0.2
)
 
$
519.1

U.S. government and agencies
 
25.9

 
—

 
—

 
25.9

Obligations of states and other political subdivisions
 
819.9

 
24.2

 
(2.0
)
 
842.1

Corporate debt securities
 
408.4

 
17.5

 
(0.5
)
 
425.4

 
 
$
1,753.9

 
$
61.3

 
$
(2.7
)
 
$
1,812.5
Available-for-Sale Current Investments Classified by Contractual Maturity Date
As of September 30, 2013, the contractual maturities of our current investments available-for-sale and our investments available-for-sale-noncurrent were as follows:
 
 
Amortized
Cost
 
Estimated
Fair Value
Current:
 
(Dollars in millions)
Due in one year or less
 
$
42.5

 
$
42.8

Due after one year through five years
 
281.6

 
284.1

Due after five years through ten years
 
442.8

 
434.9

Due after ten years
 
434.1

 
410.8

Asset-backed securities
 
410.1

 
407.4

Total current investments available-for-sale
 
$
1,611.1

 
$
1,580.0

 
 
 
 
 
 
 
Amortized
Cost
 
Estimated
Fair Value
Noncurrent:
 
(Dollars in millions)
Due after one year through five years
 
$
1.0

 
$
0.8

Due after five years through ten years
 
9.5

 
8.3

Due after ten years
 
48.8

 
42.8

Asset-backed securities
 
0.8

 
0.7

Total noncurrent investments available-for-sale
 
$
60.1

 
$
52.6
Schedule of Unrealized Loss on Investments
The following table shows our current investments' fair values and gross unrealized losses for individual securities that have been in a continuous loss position through September 30, 2013:
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
 
(Dollars in millions)
Asset-backed securities
 
$
232.8

 
$
(6.2
)
 
$
9.1

 
$
(0.4
)
 
$
241.9

 
$
(6.6
)
Obligations of states and other political subdivisions
 
542.4

 
(28.3
)
 
0.2

 
—

 
542.6

 
(28.3
)
Corporate debt securities
 
253.3

 
(9.6
)
 
2.5

 
(0.2
)
 
255.8

 
(9.8
)
 
 
$
1,028.5

 
$
(44.1
)
 
$
11.8

 
$
(0.6
)
 
$
1,040.3

 
$
(44.7
)
 
The following table shows our noncurrent investments' fair values and gross unrealized losses for individual securities that have been in a continuous loss position through September 30, 2013:
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
 
(Dollars in millions)
Asset-backed securities
 
$
—

 
$
—

 
$
0.7

 
$
(0.1
)
 
$
0.7

 
$
(0.1
)
Obligations of states and other political subdivisions
 
42.9

 
(6.0
)
 
—

 
—

 
42.9

 
(6.0
)
Corporate debt securities
 
9.0

 
(1.4
)
 
—

 
—

 
9.0

 
(1.4
)
 
 
$
51.9

 
$
(7.4
)
 
$
0.7

 
$
(0.1
)
 
$
52.6

 
$
(7.5
)
The following table shows our current investments’ fair values and gross unrealized losses for individual securities that have been in a continuous loss position through December 31, 2012:
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
 
(Dollars in millions)
Asset-backed securities
 
$
54.9

 
$
(0.2
)
 
$
0.1

 
$
—

 
$
55.0

 
$
(0.2
)
U.S. government and agencies
 
10.1

 
—

 
—

 
—

 
10.1

 
—

Obligations of states and other political subdivisions
 
192.1

 
(2.0
)
 
0.2

 
—

 
192.3

 
(2.0
)
Corporate debt securities
 
45.9

 
(0.5
)
 
—

 
—

 
45.9

 
(0.5
)
 
 
$
303.0

 
$
(2.7
)
 
$
0.3

 
$
—

 
$
303.3

 
$
(2.7
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Number of Securities Included in Loss Position of Current Investments
The following table shows the number of our individual securities-current that have been in a continuous loss position through September 30, 2013:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
101

 
7

 
108

Obligations of states and other political subdivisions
 
237

 
1

 
238

Corporate debt securities
 
213

 
3

 
216

 
 
551

 
11

 
562


The following table shows the number of our individual securities-noncurrent that have been in a continuous loss position through September 30, 2013:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
—

 
1

 
1

Obligations of states and other political subdivisions
 
18

 
—

 
18

Corporate debt securities
 
9

 
—

 
9

 
 
27

 
1

 
28