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Investments (Tables)
 6 Months Ended
Jun. 30, 2013
Investments [Abstract]  
Fair Value of Investments Available-for-Sale
As of June 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:   
 
 
June 30, 2013
 
 
Amortized
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Carrying
Value
 
 
(Dollars in millions)
Current:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
412.3

 
$
3.8

 
$
(7.6
)
 
$
408.5

U.S. government and agencies
 
26.4

 
—

 
—

 
26.4

Obligations of states and other political subdivisions
 
791.9

 
6.3

 
(30.6
)
 
767.6

Corporate debt securities
 
438.7

 
2.5

 
(11.2
)
 
430.0

 
 
$
1,669.3

 
$
12.6

 
$
(49.4
)
 
$
1,632.5

Noncurrent:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
1.2

 
$
—

 
$
(0.1
)
 
$
1.1

Obligations of states and other political subdivisions
 
14.2

 
—

 
(1.6
)
 
12.6

Corporate debt securities
 
5.3

 
—

 
(0.7
)
 
4.6

 
 
$
20.7

 
$
—

 
$
(2.4
)
 
$
18.3

 
 
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 June 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
 
$
41.9

 
$
42.1

Due after one year through five years
 
262.6

 
263.8

Due after five years through ten years
 
466.6

 
456.6

Due after ten years
 
485.9

 
461.5

Asset-backed securities
 
412.3

 
408.5

Total current investments available-for-sale
 
$
1,669.3

 
$
1,632.5

 
 
 
 
 
 
 
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
 
0.8

 
0.7

Due after ten years
 
17.7

 
15.7

Asset-backed securities
 
1.2

 
1.1

Total noncurrent investments available-for-sale
 
$
20.7

 
$
18.3
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 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
)
 
 
 
 
 
 
 
 
 
 
 
 
 
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 June 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
 
$
254.4

 
$
(7.5
)
 
$
0.4

 
$
—

 
$
254.8

 
$
(7.5
)
U.S. government and agencies
 
3.2

 
—

 
—

 
—

 
3.2

 
—

Obligations of states and other political subdivisions
 
578.9

 
(30.6
)
 
0.2

 
—

 
579.1

 
(30.6
)
Corporate debt securities
 
283.1

 
(11.2
)
 
1.3

 
(0.1
)
 
284.4

 
(11.3
)
 
 
$
1,119.6

 
$
(49.3
)
 
$
1.9

 
$
(0.1
)
 
$
1,121.5

 
$
(49.4
)
 
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 June 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
 
$
1.1

 
$
(0.1
)
 
$
—

 
$
—

 
$
1.1

 
$
(0.1
)
Obligations of states and other political subdivisions
 
12.6

 
(1.6
)
 
—

 
—

 
12.6

 
(1.6
)
Corporate debt securities
 
3.8

 
(0.6
)
 
0.8

 
(0.1
)
 
4.6

 
(0.7
)
 
 
$
17.5

 
$
(2.3
)
 
$
0.8

 
$
(0.1
)
 
$
18.3

 
$
(2.4
)
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 June 30, 2013:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
108

 
2

 
110

U.S. government and agencies
 
1

 
—

 
1

Obligations of states and other political subdivisions
 
257

 
1

 
258

Corporate debt securities
 
235

 
1

 
236

 
 
601

 
4

 
605


The following table shows the number of our individual securities-noncurrent that have been in a continuous loss position through June 30, 2013:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
2

 
—

 
2

Obligations of states and other political subdivisions
 
8

 
—

 
8

Corporate debt securities
 
5

 
1

 
6

 
 
15

 
1

 
16