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Investments (Tables)
 6 Months Ended
Jun. 30, 2014
Investments [Abstract]  
Fair Value of Investments Available-for-Sale
As of June 30, 2014 and December 31, 2013, 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, 2014
 
 
Amortized
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Carrying
Value
 
 
(Dollars in millions)
Current:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
421.7

 
$
4.1

 
$
(3.7
)
 
$
422.1

U.S. government and agencies
 
23.7

 
—

 
—

 
23.7

Obligations of states and other political subdivisions
 
728.1

 
10.1

 
(7.1
)
 
731.1

Corporate debt securities
 
489.2

 
4.7

 
(1.9
)
 
492.0

 
 
$
1,662.7

 
$
18.9

 
$
(12.7
)
 
$
1,668.9

Noncurrent:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
0.8

 
$
—

 
$
(0.1
)
 
$
0.7

 
 
$
0.8

 
$
—

 
$
(0.1
)
 
$
0.7

 
 
December 31, 2013
 
 
Amortized
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Carrying
Value
 
 
(Dollars in millions)
Current:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
394.7

 
$
3.4

 
$
(8.7
)
 
$
389.4

U.S. government and agencies
 
23.7

 
—

 
—

 
23.7

Obligations of states and other political subdivisions
 
734.3

 
5.9

 
(30.3
)
 
709.9

Corporate debt securities
 
449.8

 
3.6

 
(9.4
)
 
444.0

 
 
$
1,602.5

 
$
12.9

 
$
(48.4
)
 
$
1,567.0

Noncurrent:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
1.3

 
$
—

 
$
(0.2
)
 
$
1.1

Obligations of states and other political subdivisions
 
53.4

 
—

 
(6.3
)
 
47.1

Corporate debt securities
 
13.2

 
—

 
(1.6
)
 
11.6

 
 
$
67.9

 
$
—

 
$
(8.1
)
 
$
59.8
Available-for-Sale Current Investments Classified by Contractual Maturity Date
As of June 30, 2014, 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
 
$
58.0

 
$
58.2

Due after one year through five years
 
325.2

 
328.6

Due after five years through ten years
 
417.3

 
422.3

Due after ten years
 
440.5

 
437.7

Asset-backed securities
 
421.7

 
422.1

Total current investments available-for-sale
 
$
1,662.7

 
$
1,668.9

 
 
 
 
 
 
 
Amortized
Cost
 
Estimated
Fair Value
Noncurrent:
 
(Dollars in millions)
Asset-backed securities
 
0.8

 
0.7

Total noncurrent investments available-for-sale
 
$
0.8

 
$
0.7
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, 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
 
$
225.3

 
$
(7.9
)
 
$
22.5

 
$
(0.8
)
 
$
247.8

 
$
(8.7
)
U.S. government and agencies
 
4.0

 
—

 
—

 
—

 
4.0

 
—

Obligations of states and other political subdivisions
 
453.5

 
(23.5
)
 
79.7

 
(6.8
)
 
533.2

 
(30.3
)
Corporate debt securities
 
242.8

 
(9.0
)
 
6.7

 
(0.4
)
 
249.5

 
(9.4
)
 
 
$
925.6

 
$
(40.4
)
 
$
108.9

 
$
(8.0
)
 
$
1,034.5

 
$
(48.4
)

The following table shows the fair values and gross unrealized losses for our individual securities-noncurrent that have been in a continuous loss position through December 31, 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
 
$
0.5

 
$
(0.1
)
 
$
0.7

 
$
(0.1
)
 
$
1.2

 
$
(0.2
)
Obligations of states and other political subdivisions
 
17.4

 
(2.2
)
 
29.6

 
(4.1
)
 
47.0

 
(6.3
)
Corporate debt securities
 
7.5

 
(0.9
)
 
4.1

 
(0.7
)
 
11.6

 
(1.6
)
 
 
$
25.4

 
$
(3.2
)
 
$
34.4

 
$
(4.9
)
 
$
59.8

 
$
(8.1
)
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, 2014:
 
 
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
 
$
45.9

 
$
(0.1
)
 
$
151.7

 
$
(3.6
)
 
$
197.6

 
$
(3.7
)
Obligations of states and other political subdivisions
 
37.4

 
(0.2
)
 
301.9

 
(6.9
)
 
339.3

 
(7.1
)
Corporate debt securities
 
42.4

 
(0.1
)
 
96.1

 
(1.8
)
 
138.5

 
(1.9
)
 
 
$
125.7

 
$
(0.4
)
 
$
549.7

 
$
(12.3
)
 
$
675.4

 
$
(12.7
)
 
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 June 30, 2014:
 
 
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
)
 
 
$
—

 
$
—

 
$
0.7

 
$
(0.1
)
 
$
0.7

 
$
(0.1
)
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, 2014:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
19

 
58

 
77

Obligations of states and other political subdivisions
 
26

 
129

 
155

Corporate debt securities
 
41

 
91

 
132

 
 
86

 
278

 
364


The following table shows the number of our individual securities-noncurrent that have been in a continuous loss position through June 30, 2014:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
—

 
1

 
1

 
 
—

 
1

 
1