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Fair Value Measurements (Details) (Measured on a recurring basis, Level 2, USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Jun. 30, 2013
Assets and liabilities measured at fair value on a recurring basis    
Derivative financial instruments, Assets $ 4.1 $ 0.9
Total assets 9.6 6.3
Derivative financial instruments, Liabilities 34.4 73.1
Municipal auction rate securities
   
Assets and liabilities measured at fair value on a recurring basis    
Marketable securities $ 5.5 $ 5.4