Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Cash and Cash Equivalents (Details)

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Cash and Cash Equivalents (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Mar. 31, 2009
Components of Cash and Cash Equivalents        
Cash at bank and on hand $ 256.1 $ 9.5 $ 13.1  
Short-term deposits 9.3 9.1 6.1  
Total cash and cash equivalents $ 265.4 $ 18.6 $ 19.2 $ 42.4