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Marketable Securities (Tables)
6 Months Ended
Dec. 31, 2012
Marketable Securities  
Summary of marketable securities classified as available-for-sale

 

 

December 31, 2012

 

 

 

Unrealized

 

Estimated

 

($ in millions)

 

Cost

 

Losses

 

Fair Value

 

 

 

 

 

 

 

 

 

Non-current

 

 

 

 

 

 

 

Municipal auction rate securities

 

  $

6.0

 

  $

(0.9)

 

  $

5.1

 

 

June 30, 2012

 

 

 

Unrealized

 

Estimated

 

($ in millions)

 

Cost

 

Losses

 

Fair Value

 

 

 

 

 

 

 

 

 

Non-current

 

 

 

 

 

 

 

Municipal auction rate securities

 

  $

6.0

 

  $

(1.0)

 

  $

5.0