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Income tax (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Effective Income Tax Rate	11.50%	38.10%
Unrecognized Tax Benefits	$ 192.0
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 9.3

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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