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Marketable Securities (Tables)
 12 Months Ended
Jun. 30, 2012
Marketable Securities  
Summary of marketable securities classified as available-for-sale

 

 

June 30, 2012

 

 

 

Unrealized 

 

Estimated

 

($ in millions)

 

Cost

 

Losses

 

 Fair Value

 

Non-current

 

 

 

 

 

 

 

Municipal auction rate securities

 

$

6.0

 

$

(1.0

)

$

5.0

 

 

June 30, 2011

 

 

 

Unrealized 

 

Estimated

 

($ in millions)

 

Cost

 

Losses

 

 Fair Value

 

Current

 

 

 

 

 

 

 

Government agency bonds

 

$

13.7

 

$

—

 

$

13.7

 

Corporate bonds

 

15.1

 

—

 

15.1

 

Commercial paper

 

1.7

 

—

 

1.7

 

 

 

$

30.5

 

$

—

 

$

30.5

 

Non-current

 

 

 

 

 

 

 

Municipal auction rate securities

 

$

6.1

 

$

(0.8

)

$

5.3