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, 2014
Mar. 31, 2013
Mar. 31, 2012
Income from operations before income taxes:      
Domestic $ 141.6 $ 110.6 $ 97.1
Foreign (87.0) (76.9) 54.0
Income before income taxes 54.6 33.7 151.1
Current:      
Domestic (8.9) (5.3) (2.5)
Foreign 44.6 (14.7) 454.3
Current income tax benefit (expense) 35.7 (20.0) 451.8
Deferred:      
Domestic (3.3) 0.7 (4.2)
Foreign 12.5 31.1 5.6
Deferred income tax benefit 9.2 31.8 1.4
Total income tax benefit $ 44.9 $ 11.8 $ 453.2