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, 2014
USD ($)
Mar. 31, 2014
AUD
Mar. 31, 2013
USD ($)
Mar. 31, 2012
USD ($)
Insurance [Abstract]        
Asbestos liability, Beginning balance $ (1,693.7) (1,625.4)    
Asbestos claims paid 131.0 140.4    
AICF claims-handling costs incurred 2.5 2.7    
Change in actuarial estimate (340.3) (369.1) (163.0) (67.8)
Change in claims-handling cost estimate 0.9 1.0 5.9 8.4
Effect of foreign exchange 193.4      
Asbestos liability, Ending balance $ (1,706.2) (1,850.4) $ (1,693.7)  
Exchange rate, Beginning balance 0.9597 0.9597    
Asbestos claims paid, Exchange rate 1.0716 1.0716    
AICF claims-handling costs incurred, Exchange rate 1.0716 1.0716    
Change in actuarial estimate, Exchange rate 1.0845 1.0845    
Change in claims-handling cost estimate, Exchange rate 1.0845 1.0845    
Exchange rate, Ending balance 1.0845 1.0845 0.9597