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Fair Value Measurement (Details Textual) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2013
Jun. 30, 2012
Fair Value Disclosures [Abstract]    
Carrying value long-term debt $ 3,493.8 $ 3,561.2
Estimated fair value long-term debt $ 3,621.0 $ 3,730.7