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Investments (Tables)
 12 Months Ended
Dec. 31, 2014
Investments [Abstract]  
Fair Value of Available-for-Sale Investments
As of December 31, 2014 and 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:
 
 
2014
 
 
Amortized
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Carrying
Value
 
 
(Dollars in millions)
Current:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
437.2

 
$
2.6

 
$
(1.9
)
 
$
437.9

U.S. government and agencies
 
36.5

 
—

 
—

 
36.5

Obligations of states and other political subdivisions
 
716.7

 
17.2

 
(1.7
)
 
732.2

Corporate debt securities
 
587.0

 
2.7

 
(5.3
)
 
584.4

 
 
$
1,777.4

 
$
22.5

 
$
(8.9
)
 
$
1,791.0

Noncurrent:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
0.8

 
$
—

 
$
(0.2
)
 
$
0.6

Corporate debt securities
 
4.7

 
—

 
(0.7
)
 
4.0

 
 
$
5.5

 
$
—

 
$
(0.9
)
 
$
4.6

 
 
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 and Noncurrent Investments Classified by Contractual Maturity Date
As of December 31, 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
 
$
69.4

 
$
69.6

Due after one year through five years
 
357.5

 
357.8

Due after five years through ten years
 
486.3

 
489.6

Due after ten years
 
427.0

 
436.1

Asset-backed securities
 
437.2

 
437.9

Total current investments available-for-sale
 
$
1,777.4

 
$
1,791.0

 
 
 
 
 
 
 
Amortized
Cost
 
Estimated
Fair Value
Noncurrent:
 
(Dollars in millions)
Due after one year through five years
 
1.3

 
1.1

Due after five years through ten years
 
3.4

 
2.9

Asset-backed securities
 
0.8

 
0.6

Total noncurrent investments available-for-sale
 
$
5.5

 
$
4.6
Number of Securities Included in Loss Position of Current and Noncurrent Investments
The following table shows the number of our individual securities-current that have been in a continuous loss position at December 31, 2014:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
124

 
51

 
175

U.S. government and agencies
 
4

 
—

 
4

Obligations of states and other political subdivisions
 
21

 
46

 
67

Corporate debt securities
 
320

 
69

 
389

 
 
469

 
166

 
635


The following table shows the number of our individual securities-noncurrent that have been in a continuous loss position through December 31, 2014:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
—

 
1

 
1

Corporate debt securities
 
9

 
—

 
9

 
 
9

 
1

 
10
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 our noncurrent investments' fair value and gross unrealized losses for our 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
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 in a continuous loss position as of December 31, 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
 
$
149.3

 
$
(0.5
)
 
$
112.5

 
$
(1.4
)
 
$
261.8

 
$
(1.9
)
U.S. government and agencies
 
20.7

 
—

 
—

 
—

 
20.7

 
—

Obligations of states and other political subdivisions
 
37.3

 
(0.1
)
 
104.8

 
(1.6
)
 
142.1

 
(1.7
)
Corporate debt securities
 
299.1

 
(3.9
)
 
56.0

 
(1.4
)
 
355.1

 
(5.3
)
 
 
$
506.4

 
$
(4.5
)
 
$
273.3

 
$
(4.4
)
 
$
779.7

 
$
(8.9
)
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 December 31, 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
 
$
—

 
$
—

 
$
0.6

 
$
(0.2
)
 
$
0.6

 
$
(0.2
)
Corporate debt securities
 
4.0

 
(0.7
)
 
—

 
—

 
4.0

 
(0.7
)
 
 
$
4.0

 
$
(0.7
)
 
$
0.6

 
$
(0.2
)
 
$
4.6

 
$
(0.9
)