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

Asbestos - Summary of Net Unfunded AFFA Liability, Net of Tax (Detail)

v3.20.1
Asbestos - Summary of Net Unfunded AFFA Liability, Net of Tax (Detail)
$ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2020
AUD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Asbestos Net Liability [Roll Forward]        
Asbestos Net Liability $ (886.9)   $ (983.0)  
Deferred income taxes - Asbestos 319.1   349.3  
Income Tax Payable Asbestos 23.4   25.3  
Net Unfunded AFFA liability, net of tax, Beginning Balance (608.4)      
AICF operating costs paid - non claims-handling 1.7   (1.5) $ (1.9)
Change in claims handling cost estimate 0.1   1.1 $ (0.5)
Net Unfunded AFFA liability, net of tax, Ending Balance (544.4)   (608.4)  
Asbestos Liability        
Asbestos Net Liability [Roll Forward]        
Asbestos Net Liability (986.4)   (1,089.6)  
Asbestos claims paid 104.6 $ 153.3    
AICF claims-handling costs incurred (paid) 1.0      
Change in actuarial estimate (133.8)      
Change in claims handling cost estimate (0.1)      
Effect of foreign exchange (131.3)      
Insurance Receivables        
Asbestos Net Liability [Roll Forward]        
Asbestos Net Liability 43.5   51.2  
Change in actuarial estimate 5.7      
Insurance recoveries 7.6      
Effect of foreign exchange 5.8      
Restricted Cash and Investments        
Asbestos Net Liability [Roll Forward]        
Asbestos Net Liability 58.0   57.5  
Asbestos claims paid (104.6)      
Payment received in accordance with AFFA 108.9      
AICF claims-handling costs incurred (paid) (1.0)      
AICF operating costs paid - non claims-handling 1.7      
Insurance recoveries (7.6)      
Other movements 3.2      
Effect of foreign exchange 11.9      
Other Assets and Liabilities        
Asbestos Net Liability [Roll Forward]        
Asbestos Net Liability (2.0)   $ (2.1)  
Other movements (1.1)      
Effect of foreign exchange (1.2)      
Net Unfunded AFFA Liability        
Asbestos Net Liability [Roll Forward]        
Payment received in accordance with AFFA 108.9 $ 156.7    
AICF operating costs paid - non claims-handling (1.7)      
Change in actuarial estimate (128.1)      
Change in claims handling cost estimate 0.1      
Insurance recoveries 0.0      
Other movements 2.1      
Effect of foreign exchange 114.8      
Deferred Tax Assets        
Asbestos Net Liability [Roll Forward]        
Impact on deferred income tax due to change in actuarial estimate (38.4)      
Movement in income tax payable 25.8      
Other movements 0.3      
Effect of foreign exchange 43.1      
Income Tax Payable        
Asbestos Net Liability [Roll Forward]        
Movement in income tax payable (0.8)      
Other movements 0.0      
Effect of foreign exchange 2.7      
Net Unfunded AFFA Liability, net of tax        
Asbestos Net Liability [Roll Forward]        
Asbestos claims paid 0.0      
Payment received in accordance with AFFA 108.9      
AICF claims-handling costs incurred (paid) 0.0      
AICF operating costs paid - non claims-handling (1.7)      
Change in actuarial estimate (128.1)      
Change in claims handling cost estimate 0.1      
Impact on deferred income tax due to change in actuarial estimate 38.4      
Insurance recoveries 0.0      
Movement in income tax payable (25.0)      
Other movements 2.4      
Effect of foreign exchange $ 69.0