v3.26.1
Organization and Significant Accounting Policies (Tables)
 12 Months Ended
Mar. 31, 2026
Accounting Policies [Abstract]  
Schedule of Reconciliation of Restricted Cash and Restricted Cash - Asbestos
The following table provides a reconciliation of Cash and cash equivalents, Restricted cash and Restricted cash - Asbestos reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows:
 March 31
(Millions of US dollars)20262025
Cash and cash equivalents$269.2 $562.7 
Restricted cash and cash equivalents5.0 5.0 
Restricted cash and cash equivalents - Asbestos70.2 37.9 
Total$344.4 $605.6 
Schedule of Reconciliation of Cash and Cash Equivalents - Asbestos
The following table provides a reconciliation of Cash and cash equivalents, Restricted cash and Restricted cash - Asbestos reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows:
 March 31
(Millions of US dollars)20262025
Cash and cash equivalents$269.2 $562.7 
Restricted cash and cash equivalents5.0 5.0 
Restricted cash and cash equivalents - Asbestos70.2 37.9 
Total$344.4 $605.6 
Schedule of Property, Plant and Equipment Estimated Useful Lives Depreciation of property, plant and equipment is computed using the straight-line method over the following estimated useful lives: 
  Years
Buildings
10 to 50
Buildings Improvements
1 to 30
Leasehold Improvements
1 to 40
Machinery and Equipment
1 to 30
Schedule of Basic and Dilutive Common Shares Outstanding Used in Determining Net Income Per Share
The following table sets for the computation of basic and diluted earnings per share:
 Years Ended March 31
(Millions of US dollars and shares, except per share data)202620252024
Net income$104.0 $424.0 $510.2 
Basic common shares outstanding541.8 430.8 438.4 
Dilutive effect of stock awards3.7 1.3 1.2 
Diluted common shares outstanding545.5 432.1 439.6 
Net income per share of common stock:
Basic $0.19 $0.98 $1.16 
Diluted$0.19 $0.98 $1.16