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Available-for-sale Securities Fair Value and Gross Realized Gains (Losses) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
Investments, Debt and Equity Securities [Abstract] |  |  |
Available-for-sale securities, gross realized gains | $ 9.5 | $ 5.9 | $ 2.0
Available-for-sale securities, gross realized losses | 0.7 | 0.2 | 0.2
Fair value of sold available-for-sale securities | 165.1 | 141.1 | 134.7
Other-than-temporary impairments | $ 0 | $ 0.1 | $ 0.8
Bank of America common stock owned | 1,800,000 | 1,800,000 | 1,800,000

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