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Retirement Benefits Defined Contribution Savings Plans (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]      
Defined Contribution Plan, Cost Recognized $ 15.6 $ 14.2 $ 11.0