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Investments (Tables)
 12 Months Ended
Dec. 31, 2015
Investments [Abstract]  
Fair Value of Available-for-Sale Investments
As of December 31, 2015 and 2014, 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:
 
 
2015
 
 
Amortized
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Carrying
Value
 
 
(Dollars in millions)
Current:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
560.4

 
$
1.0

 
$
(5.8
)
 
$
555.6

U.S. government and agencies
 
32.0

 
—

 
(0.1
)
 
31.9

Obligations of states and other political subdivisions
 
913.6

 
24.3

 
(1.4
)
 
936.5

Corporate debt securities
 
703.7

 
1.0

 
(10.3
)
 
694.4

 
 
$
2,209.7

 
$
26.3

 
$
(17.6
)
 
$
2,218.4

Noncurrent:
 
 
 
 
 
 
 
 
Corporate debt securities
 
34.2

 
—

 
(6.6
)
 
27.6

 
 
$
34.2

 
$
—

 
$
(6.6
)
 
$
27.6

 
 
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
Available for Sale Current and Noncurrent Investments Classified by Contractual Maturity Date
As of December 31, 2015, 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
 
$
51.5

 
$
51.4

Due after one year through five years
 
514.2

 
511.7

Due after five years through ten years
 
579.9

 
582.1

Due after ten years
 
503.7

 
517.6

Asset-backed securities
 
560.4

 
555.6

Total current investments available-for-sale
 
$
2,209.7

 
$
2,218.4

 
 
 
 
 
 
 
Amortized
Cost
 
Estimated
Fair Value
Noncurrent:
 
(Dollars in millions)
Due after one year through five years
 
$
15.8

 
$
13.1

Due after five years through ten years
 
17.2

 
13.4

Due after ten years
 
1.2

 
1.1

Total noncurrent investments available-for-sale
 
$
34.2

 
$
27.6
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 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 value and gross unrealized losses for our 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
)
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, 2015:  
 
 
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
 
$
437.6

 
$
(5.2
)
 
$
34.0

 
$
(0.6
)
 
$
471.6

 
$
(5.8
)
U.S. government and agencies
 
28.2

 
(0.1
)
 
—

 
—

 
28.2

 
(0.1
)
Obligations of states and other political subdivisions
 
88.5

 
(0.7
)
 
19.7

 
(0.7
)
 
108.2

 
(1.4
)
Corporate debt securities
 
529.0

 
(9.4
)
 
27.3

 
(0.9
)
 
556.3

 
(10.3
)
 
 
$
1,083.3

 
$
(15.4
)
 
$
81.0

 
$
(2.2
)
 
$
1,164.3

 
$
(17.6
)
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, 2015:
 
 
Less than 12 Months
 
12 Months or More
 
Total
 
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
Fair
Value
 
Unrealized
Losses
 
 
(Dollars in millions)
Corporate debt securities
 
$
18.0

 
$
(4.3
)
 
$
9.6

 
$
(2.3
)
 
$
27.6

 
$
(6.6
)
 
 
$
18.0

 
$
(4.3
)
 
$
9.6

 
$
(2.3
)
 
$
27.6

 
$
(6.6
)
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, 2015:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
266

 
39

 
305

U.S. government and agencies
 
8

 
—

 
8

Obligations of states and other political subdivisions
 
71

 
14

 
85

Corporate debt securities
 
505

 
32

 
537

 
 
850

 
85

 
935


The following table shows the number of our individual securities-noncurrent that have been in a continuous loss position through December 31, 2015:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Corporate debt securities
 
21

 
9

 
30

 
 
21

 
9

 
30