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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011	Dec. 31, 2010
Income Taxes (Textual) [Abstract]
Income tax expense	$ 38.4	$ 32.0	$ 97.7	$ 53.8
Effective tax rate	24.30%	22.70%	22.80%	13.90%
United States federal statutory rate			35.00%
Overall effect of foreign tax rates on effective tax rate	7.30%	10.90%	8.60%	11.70%
Discrete tax benefits associated with tax authority settlement			$ 6.2	$ 32.0
Prior years' impact of discrete net tax benefits on effective tax rate			1.40%	8.30%

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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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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