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Fair Value Measurements (Details) (Measured on a recurring basis, USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Jun. 30, 2013
Assets and liabilities measured at fair value on a recurring basis    
Derivative financial instruments, Assets $ 0.3 $ 0.9
Total assets 5.8 6.3
Derivative financial instruments, Liabilities 63.9 73.1
Level 2
   
Assets and liabilities measured at fair value on a recurring basis    
Derivative financial instruments, Assets 0.3 0.9
Total assets 5.8 6.3
Derivative financial instruments, Liabilities 63.9 73.1
Municipal auction rate securities
   
Assets and liabilities measured at fair value on a recurring basis    
Marketable securities 5.5 5.4
Municipal auction rate securities | Level 2
   
Assets and liabilities measured at fair value on a recurring basis    
Marketable securities $ 5.5 $ 5.4