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Income Taxes (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Income Taxes [Line Items]        
Provision for income taxes $ 30.7 $ 38.4 $ 75.9 $ 97.7
Effective tax rate 22.40% 24.30% 22.70% 22.80%
United States federal statutory rate     35.00%  
Overall effect of foreign tax rates on effective tax rate 9.60% 7.30% 9.40% 8.60%
Discrete tax benefits associated with tax authority settlement       $ 6.2
Prior years' impact of discrete net tax benefits on effective tax rate       1.40%