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Available-for-sale Securities Fair Value and Gross Realized Gains (Losses) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Sep. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale securities, gross realized gains $ 1.4
Available-for-sale securities, gross realized losses 0.3
Fair value of sold available-for-sale securities 48.5
Other-than-temporary impairments $ 0