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Marketable Securities (Tables)
12 Months Ended
Jun. 30, 2013
Marketable Securities  
Summary of marketable securities classified as available-for-sale

 

June 30, 2013

 

 

 

Unrealized

 

Estimated

 

($ in millions)

 

Cost

 

Losses

 

Fair Value

 

Non-current

 

 

 

 

 

 

 

Municipal auction rate securities

 

$

5.9

 

$

(0.5

)

$

5.4

 

 

June 30, 2012

 

 

 

Unrealized

 

Estimated

 

($ in millions)

 

Cost

 

Losses

 

Fair Value

 

Non-current

 

 

 

 

 

 

 

Municipal auction rate securities

 

$

6.0

 

$

(1.0

)

$

5.0