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

Asbestos - Additional Information (Detail)

v3.19.1
Asbestos - Additional Information (Detail)
 3 Months Ended 12 Months Ended 60 Months Ended
Jul. 01, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2017
AUD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2019
AUD ($)
Mar. 31, 2019
AUD ($)
Mar. 31, 2018
AUD ($)
Jul. 31, 2017
AUD ($)
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]                            
Asbestos adjustments     $ 43,600,000 $ 56,800,000     $ 22,000,000 $ 156,400,000 $ (40,400,000)          
Discounted (but inflated) central estimate lower range value             1,000,000,000     $ 1,000,000,000   $ 1,400,000,000    
Discounted (but inflated) central estimate high range value             2,200,000,000     2,200,000,000   3,100,000,000    
Undiscounted (but inflated) central estimate lower range value             1,100,000,000     1,100,000,000   1,600,000,000    
Undiscounted (but inflated) central estimate high range value             2,800,000,000     2,800,000,000   3,900,000,000    
Payment to fund             103,000,000 102,200,000 $ 91,100,000 472,100,000 $ 595,300,000      
Net cash provided by operating activities   $ 295,000,000     $ 292,100,000 $ 260,400,000 287,600,000              
Restricted short-term investments - Asbestos   38,400,000         17,700,000 38,400,000   17,700,000   25,000,000 $ 50,000,000 $ 100,000,000
Adjustment to Restricted Short-Term Investments Asbestos             0              
Secured standby loan facility maximum borrowing capacity             $ 227,100,000     $ 227,100,000   $ 320,000,000.0    
Maturity date of secured standby loan facility             Nov. 01, 2030              
Loan facility, outstanding balance   $ 0           $ 0            
Rate of interest of Benchmark Bonds (as percent)             6.00%              
Maturity date of Benchmark Bonds             May 01, 2020              
AICF Funding                            
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]                            
Maximum percentage of Free Cash Flow contributed to AICF (as percent)             35.00%              
Net cash provided by operating activities             $ 288,400,000              
AICF Funding | Scenario, Forecast [Member]                            
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Line Items]                            
Payment to fund $ 100,900,000