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Fair Value Measurements (Details) (Measured on a recurring basis, Level 2, USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Jun. 30, 2014
Assets and liabilities measured at fair value on a recurring basis    
Derivative financial instruments, Assets $ 6.1 $ 20.4
Total assets 11.3 25.6
Derivative financial instruments, Liabilities 25.1 10.9
Municipal auction rate securities
   
Assets and liabilities measured at fair value on a recurring basis    
Marketable securities $ 5.2 $ 5.2