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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Cash and Cash Equivalents [Abstract]
Cash at bank and on hand	$ 60.0us-gaap_Cash	$ 70.9us-gaap_Cash	$ 55.5us-gaap_Cash
Short-term deposits	7.0us-gaap_CashEquivalentsAtCarryingValue	96.6us-gaap_CashEquivalentsAtCarryingValue	98.2us-gaap_CashEquivalentsAtCarryingValue
Total cash and cash equivalents	$ 67.0	$ 167.5	$ 153.7	$ 265.4

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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