Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes - Components of Income Tax Benefit (Expense) (Detail)

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Income Taxes - Components of Income Tax Benefit (Expense) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Income (loss) from operations before income taxes:      
Domestic $ 110.6 $ 97.1 $ 66.5
Foreign (76.9) 54.0 30.1
Income before income taxes 33.7 151.1 96.6
Current:      
Domestic (5.3) (2.5) (15.6)
Foreign (14.7) 454.3 (447.4)
Current income tax (expense) benefit (20.0) 451.8 (463.0)
Deferred:      
Domestic 0.7 (4.2) (22.2)
Foreign 31.1 5.6 41.6
Deferred income tax benefit 31.8 1.4 19.4
Total income tax benefit (expense) $ 11.8 $ 453.2 $ (443.6)