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, 2018
$ in Millions, $ in Millions
USD ($)
AUD ($)
Discounted & Inflated [Member]    
Asbestos Claims [Line Items]    
Central Estimate, net of insurance recoveries $ 1,423.1 $ 1,852.9
Undiscounted but Inflated [Member]    
Asbestos Claims [Line Items]    
Central Estimate, net of insurance recoveries 1,828.6 2,380.9
Undiscounted and Uninflated [Member]    
Asbestos Claims [Line Items]    
Central Estimate, net of insurance recoveries $ 1,108.2 $ 1,442.9