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Available-for-sale Securities Fair Value and Gross Realized Gains (Losses) (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended
Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]  
Available-for-sale securities, gross realized gains $ 5.0
Available-for-sale securities, gross realized losses 1.0
Fair value of sold available-for-sale securities 153.7
Other-than-temporary impairments $ 0