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

Income Taxes - Reconciled Tax at Statutory Rates (Detail)

v2.4.0.6
Income Taxes - Reconciled Tax at Statutory Rates (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Income Taxes [Line Items]      
Income tax benefit (expense) at statutory tax rates $ 8.8 $ (28.4) $ (18.3)
US state income taxes, net of the federal benefit (0.1) (0.8) (1.7)
Asbestos - effect of foreign exchange (0.3) (1.9) (31.7)
Expenses not deductible (2.0) (0.7) (4.0)
Non-assessable items 1.8 0.4  
Repatriation of foreign earnings 2.7 (0.1) (32.6)
Amortisation of intangibles 2.0 1.7 (5.9)
Taxes on foreign income (1.6) 2.6 (2.0)
Tax assessment in dispute   478.4 (349.1)
Other permanent items 0.5 2.0 1.7
Total income tax benefit (expense) $ 11.8 $ 453.2 $ (443.6)
Effective tax (benefit) rate (35.00%) (299.90%) 459.20%