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Fair Value Measurements (Details) (Measured on a recurring basis, Level 2, USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jun. 30, 2014
Assets and liabilities measured at fair value on a recurring basis    
Derivative financial instruments, Assets $ 5.4us-gaap_DerivativeAssets $ 20.4us-gaap_DerivativeAssets
Total assets 10.6us-gaap_AssetsFairValueDisclosure 25.6us-gaap_AssetsFairValueDisclosure
Derivative financial instruments, Liabilities 35.1us-gaap_DerivativeLiabilities 10.9us-gaap_DerivativeLiabilities
Municipal auction rate securities
   
Assets and liabilities measured at fair value on a recurring basis    
Marketable securities $ 5.2us-gaap_AvailableForSaleSecurities
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$ 5.2us-gaap_AvailableForSaleSecurities
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