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

Asbestos - Summary of Changes in Asbestos Liability (Detail)

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Asbestos - Summary of Changes in Asbestos Liability (Detail)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
USD ($)
Rate
Mar. 31, 2013
AUD
Mar. 31, 2012
USD ($)
Rate
Mar. 31, 2011
USD ($)
Asbestos Claims [Line Items]        
Asbestos liability, Beginning balance $ (1,662.6) (1,598.4)    
Asbestos claims paid 125.1 121.3    
AICF claims-handling costs incurred 2.5 2.4    
Change in actuarial estimate (163.0) (156.4) (67.8) 9.8
Change in estimate of AICF claims-handling costs 5.9 5.7 8.4 12.2
Loss on foreign currency exchange (1.6)      
Asbestos liability, Ending balance $ (1,693.7) (1,625.4) $ (1,662.6)  
Exchange rate, Beginning balance 0.9614 0.9614    
Asbestos claims paid, Exchange rate 0.9694 0.9694    
AICF claims-handling costs incurred, Exchange rate 0.9694 0.9694    
Change in actuarial estimate, Exchange rate 0.9597 0.9597    
Change in estimate of AICF claims-handling costs, Exchange rate 0.9597 0.9597    
Exchange rate, Ending balance 0.9597 0.9597 0.9614