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

Asbestos - Central Estimates, Net of Insurance Recoveries (Detail)

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Asbestos - Central Estimates, Net of Insurance Recoveries (Detail) - Mar. 31, 2017
AUD in Millions, $ in Millions
USD ($)
AUD
Discounted & Inflated [Member]    
Asbestos Claims [Line Items]    
Central Estimate, net of insurance recoveries $ 1,330.1 AUD 1,740.1
Undiscounted but Inflated [Member]    
Asbestos Claims [Line Items]    
Central Estimate, net of insurance recoveries 1,681.5 2,199.7
Undiscounted and Uninflated [Member]    
Asbestos Claims [Line Items]    
Central Estimate, net of insurance recoveries $ 1,059.2 AUD 1,385.7