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Fair Value (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2011
Jun. 30, 2011
Level 1 Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 123.0 $ 139.0
Level 2 Inputs [Member]
   
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Secured borrowings fair value in excess of carrying value $ 0.5 $ 1.1