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

Asbestos - Asbestos Adjustments (Detail)

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Asbestos - Asbestos Adjustments (Detail)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
USD ($)
Mar. 31, 2013
AUD
Mar. 31, 2012
USD ($)
Mar. 31, 2011
USD ($)
Change in estimates:        
Change in actuarial estimate - asbestos liability $ (163.0) (156.4) $ (67.8) $ 9.8
Change in actuarial estimate - insurance receivable 27.9   49.8 (0.5)
Change in estimate - AICF claims-handling costs 5.9 5.7 8.4 12.2
Subtotal - Change in estimates (129.2)   (9.6) 21.5
Write-back of insurance receivables 11.9 11.5    
Gain (Loss) on foreign currency exchange 0.2   (6.2) (107.3)
Total Asbestos Adjustments $ (117.1)   $ (15.8) $ (85.8)