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Investments (Tables)
 6 Months Ended
Jun. 30, 2015
Investments [Abstract]  
Fair Value of Investments Available-for-Sale
As of June 30, 2015 and December 31, 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:  
 
 
 
June 30, 2015
 
 
Amortized
Cost
 
Gross
Unrealized
Holding
Gains
 
Gross
Unrealized
Holding
Losses
 
Carrying
Value
 
 
(Dollars in millions)
Current:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
623.7

 
$
2.3

 
$
(3.6
)
 
$
622.4

U.S. government and agencies
 
28.2

 
—

 
—

 
28.2

Obligations of states and other political subdivisions
 
979.0

 
10.0

 
(9.0
)
 
980.0

Corporate debt securities
 
743.9

 
2.6

 
(5.6
)
 
740.9

 
 
$
2,374.8

 
$
14.9

 
$
(18.2
)
 
$
2,371.5

Noncurrent:
 
 
 
 
 
 
 
 
Asset-backed securities
 
$
0.6

 
$
—

 
$
(0.2
)
 
$
0.4

Obligations of states and other political subdivisions
 
1.7

 
—

 
(0.2
)
 
1.5

Corporate debt securities
 
5.3

 
—

 
(0.7
)
 
4.6

 
 
$
7.6

 
$
—

 
$
(1.1
)
 
$
6.5

 
 
December 31, 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 Investments Classified by Contractual Maturity Date
As of June 30, 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
 
$
41.7

 
$
41.8

Due after one year through five years
 
538.3

 
538.1

Due after five years through ten years
 
642.8

 
640.9

Due after ten years
 
528.3

 
528.3

Asset-backed securities
 
623.7

 
622.4

Total current investments available-for-sale
 
$
2,374.8

 
$
2,371.5

 
 
 
 
 
 
 
Amortized
Cost
 
Estimated
Fair Value
Noncurrent:
 
(Dollars in millions)
Due after five years through ten years
 
7.0

 
6.1

Asset-backed securities
 
0.6

 
0.4

Total noncurrent investments available-for-sale
 
$
7.6

 
$
6.5
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 June 30, 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
 
$
360.8

 
$
(3.1
)
 
$
40.9

 
$
(0.5
)
 
$
401.7

 
$
(3.6
)
U.S. government and agencies
 
1.8

 
—

 
—

 
—

 
1.8

 
—

Obligations of states and other political subdivisions
 
503.0

 
(8.3
)
 
19.4

 
(0.7
)
 
522.4

 
(9.0
)
Corporate debt securities
 
414.6

 
(5.0
)
 
22.9

 
(0.6
)
 
437.5

 
(5.6
)
 
 
$
1,280.2

 
$
(16.4
)
 
$
83.2

 
$
(1.8
)
 
$
1,363.4

 
$
(18.2
)
 
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, 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
 
$
—

 
$
—

 
$
0.4

 
$
(0.2
)
 
$
0.4

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

 
—

 
1.5

 
(0.2
)
 
1.5

 
(0.2
)
Corporate debt securities
 
4.4

 
(0.7
)
 
0.2

 
—

 
4.6

 
(0.7
)
 
 
$
4.4

 
$
(0.7
)
 
$
2.1

 
$
(0.4
)
 
$
6.5

 
$
(1.1
)
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 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
)
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, 2015:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
193

 
32

 
225

U.S. government and agencies
 
2

 
—

 
2

Obligations of states and other political subdivisions
 
344

 
13

 
357

Corporate debt securities
 
364

 
25

 
389

 
 
903

 
70

 
973


The following table shows the number of our individual securities-noncurrent that have been in a continuous loss position through June 30, 2015:
 
 
Less than
12 Months
 
12 Months
or More
 
Total
Asset-backed securities
 
—

 
1

 
1

Obligations of states and other political subdivisions
 
—

 
1

 
1

Corporate debt securities
 
8

 
1

 
9

 
 
8

 
3

 
11