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Fair Value Measurements (Details) (Measured on a recurring basis, USD $)
In Millions, unless otherwise specified
Jun. 30, 2014
Jun. 30, 2013
Assets and liabilities measured at fair value on a recurring basis    
Derivative financial instruments, Assets $ 20.4 $ 0.9
Total assets 25.6 6.3
Derivative financial instruments, Liabilities 10.9 73.1
Level 2
   
Assets and liabilities measured at fair value on a recurring basis    
Derivative financial instruments, Assets 20.4 0.9
Total assets 25.6 6.3
Derivative financial instruments, Liabilities 10.9 73.1
Municipal auction rate securities
   
Assets and liabilities measured at fair value on a recurring basis    
Marketable securities 5.2 5.4
Municipal auction rate securities | Level 2
   
Assets and liabilities measured at fair value on a recurring basis    
Marketable securities $ 5.2 $ 5.4