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Cash Equivalents and Investments (Tables)
 3 Months Ended
Mar. 31, 2014
Cash Equivalents and Investments [Abstract]  
Unrealized gains and losses and fair value of available-for-sale and trading securities
The following tables summarize the Company's unrealized gains and losses and fair value of investments designated as available-for-sale and trading securities as of March 31, 2014 and December 31, 2013 (in millions):
 
Amortized
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
As of March 31, 2014
 
 
 
 
 
 
 
Fixed income securities:
 
 
 
 
 
 
 
Asset-backed securities
$
135.4

 
$
—

 
$
(0.1
)
 
$
135.3

Certificates of deposit
12.0

 
—

 
—

 
12.0

Commercial paper
1.2

 
—

 
—

 
1.2

Corporate debt securities
411.0

 
1.3

 
(0.1
)
 
412.2

Foreign government debt securities
5.0

 
—

 
—

 
5.0

Government-sponsored enterprise obligations
88.3

 
—

 
—

 
88.3

U.S. government securities
241.5

 
0.1

 
—

 
241.6

Total fixed income securities
894.4

 
1.4

 
(0.2
)
 
895.6

Money market funds
1,183.0

 
—

 
—

 
1,183.0

Mutual funds
4.0

 
0.1

 
—

 
4.1

Publicly-traded equity securities
7.2

 
—

 
(0.8
)
 
6.4

Total available-for-sale securities
2,088.6

 
1.5

 
(1.0
)
 
2,089.1

Trading securities in mutual funds(*)
16.1

 
—

 
—

 
16.1

Total
$
2,104.7

 
$
1.5

 
$
(1.0
)
 
$
2,105.2

 
 
 
 
 
 
 
 
Reported as:
 
 
 
 
 
 
 
Cash equivalents
$
1,135.1

 
$
—

 
$
—

 
$
1,135.1

Restricted investments
70.7

 
0.1

 
—

 
70.8

Short-term investments
378.6

 
0.3

 
(0.8
)
 
378.1

Long-term investments
520.3

 
1.1

 
(0.2
)
 
521.2

Total
$
2,104.7

 
$
1.5

 
$
(1.0
)
 
$
2,105.2


________________________________
(*) 
Balance includes the Company's non-qualified deferred compensation plan assets.
 
Amortized
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
As of December 31, 2013
 
 
 
 
 
 
 
Fixed income securities:
 
 
 
 
 
 
 
Asset-backed securities
$
249.9

 
$
0.1

 
$
(0.1
)
 
$
249.9

Certificates of deposit
27.6

 
—

 
—

 
27.6

Commercial paper
6.9

 
—

 
—

 
6.9

Corporate debt securities
813.6

 
2.0

 
(0.3
)
 
815.3

Foreign government debt securities
10.7

 
—

 
—

 
10.7

Government-sponsored enterprise obligations
306.2

 
0.1

 
(0.1
)
 
306.2

U.S. government securities
303.3

 
0.1

 
(0.1
)
 
303.3

Total fixed income securities
1,718.2

 
2.3

 
(0.6
)
 
1,719.9

Money market funds
1,043.7

 
—

 
—

 
1,043.7

Mutual funds
3.9

 
0.1

 
—

 
4.0

Publicly-traded equity securities
12.0

 
104.5

 
(1.9
)
 
114.6

Total available-for-sale securities
2,777.8

 
106.9

 
(2.5
)
 
2,882.2

Trading securities in mutual funds(*)
15.4

 
—

 
—

 
15.4

Total
$
2,793.2

 
$
106.9

 
$
(2.5
)
 
$
2,897.6

 
 
 
 
 
 
 
 
Reported as:
 
 
 
 
 
 
 
Cash equivalents
$
996.2

 
$
—

 
$
—

 
$
996.2

Restricted investments
87.5

 
0.1

 
—

 
87.6

Short-term investments
459.0

 
104.9

 
(2.0
)
 
561.9

Long-term investments
1,250.5

 
1.9

 
(0.5
)
 
1,251.9

Total
$
2,793.2

 
$
106.9

 
$
(2.5
)
 
$
2,897.6


________________________________
(*) 
Balance includes the Company's non-qualified deferred compensation plan assets.
Maturities of fixed income securities
The following table presents the contractual maturities of the Company's total fixed income securities as of March 31, 2014 (in millions):
 
Amortized
Cost
 
Gross Unrealized
Gains
 
Gross Unrealized
Losses
 
Estimated Fair
Value
Due within one year
$
374.0

 
$
0.3

 
$
—

 
$
374.3

Due between one and five years
520.4

 
1.1

 
(0.2
)
 
521.3

Total
$
894.4

 
$
1.4

 
$
(0.2
)
 
$
895.6
Available-for-sale securities in unrealized loss position
The following tables present the Company's available-for-sale securities that were in an unrealized loss position as of March 31, 2014 and December 31, 2013 (in millions):
 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
As of March 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
Asset-backed securities(1)
$
65.9

 
$
(0.1
)
 
$
6.0

 
$
—

 
$
71.9

 
$
(0.1
)
Corporate debt securities
54.1

 
(0.1
)
 
—

 
—

 
54.1

 
(0.1
)
Foreign government debt securities(1)
—

 
—

 
5.0

 
—

 
5.0

 
—

Government-sponsored enterprise obligations(2)
34.9

 
—

 
—

 
—

 
34.9

 
—

U.S. government securities(2)
6.9

 
—

 
—

 
—

 
6.9

 
—

Total fixed income securities
161.8

 
(0.2
)
 
11.0

 
—

 
172.8

 
(0.2
)
Publicly-traded equity securities
6.4

 
(0.8
)
 
—

 
—

 
6.4

 
(0.8
)
Total available-for-sale securities
$
168.2

 
$
(1.0
)
 
$
11.0

 
$
—

 
$
179.2

 
$
(1.0
)
________________________________
(1) 
Balances greater than 12 months include investments that were in an immaterial unrealized loss position as of March 31, 2014.
(2) 
Balances less than 12 months include investments that were in an immaterial unrealized loss position as of March 31, 2014.

 
Less than 12 Months
 
12 Months or Greater
 
Total
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
 
Fair
Value
 
Unrealized
Loss
As of December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Fixed income securities:
 
 
 
 
 
 
 
 
 
 
 
Asset-backed securities(1)
$
153.0

 
$
(0.1
)
 
$
0.6

 
$
—

 
$
153.6

 
$
(0.1
)
Corporate debt securities(1)
156.1

 
(0.3
)
 
9.7

 
—

 
165.8

 
(0.3
)
Foreign government debt securities(2)
10.0

 
—

 
—

 
—

 
10.0

 
—

Government-sponsored enterprise obligations
123.1

 
(0.1
)
 
—

 
—

 
123.1

 
(0.1
)
U.S. government securities
119.7

 
(0.1
)
 
—

 
—

 
119.7

 
(0.1
)
Total fixed income securities
561.9

 
(0.6
)
 
10.3

 
—

 
572.2

 
(0.6
)
Publicly-traded equity securities
6.8

 
(1.9
)
 
—

 
—

 
6.8

 
(1.9
)
Total available-for-sale securities
$
568.7

 
$
(2.5
)
 
$
10.3

 
$
—

 
$
579.0

 
$
(2.5
)
 ________________________________
(1) 
Balances greater than 12 months include investments that were in an immaterial unrealized loss position as of December 31, 2013.
(2) 
Balances less than 12 months include investments that were in an immaterial unrealized loss position as of December 31, 2013.