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Investments (Tables)
 12 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost And Approximate Fair Value Of Held To Maturity Securities
The amortized cost and approximate fair value of held-to-maturity securities are as follows:
 
December 31, 2013
 
December 31, 2012
 
Current
 
Noncurrent
 
Current
 
Noncurrent
Government and Corporate Debt Securities
 
 
 
 
 
 
 
Amortized cost
$
0.5

 
$
3.1

 
$
0.6

 
$
2.8

Unrealized gains
—

 
0.1

 
—

 
0.1

Unrealized losses
—

 
(0.1
)
 
—

 
—

Fair value
$
0.5

 
$
3.1

 
$
0.6

 
$
2.9
Held To Maturity Securities Debt Maturities
Maturities of held-to-maturity securities at December 31, 2013 are as follows:
 
Amortized
Cost
 
Approximate
Fair Value
Within One Year
$
0.5

 
$
0.5

One to Five Years
1.2

 
1.2

Five to Ten Years
0.1

 
0.1

After Ten Years
1.8

 
1.8

Total
$
3.6

 
$
3.6