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Income tax (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2011
Income Taxes [Abstract]
Effective Income Tax Rate, Continuing Operations	11.00%	12.40%
Unrecognized Tax Benefits			$ 58.1
Unrecognized Tax Benefits, Period Increase (Decrease)	$ 13.3

- 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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