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Property, Plant and Equipment (Tables)
12 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Components of Property, Plant and Equipment
Property, plant and equipment consist of the following components:
 31 March
(Millions of US dollars)20222021
Land$83.6 $85.2 
Buildings530.6 512.8 
Machinery and equipment1,880.0 1,775.5 
Construction in progress167.9 91.8 
Property, plant and equipment, at cost2,662.1 2,465.3 
Less accumulated depreciation(1,205.1)(1,093.0)
Property, plant and equipment, net$1,457.0 $1,372.3 
Summary of Impairment Charges The following table summarizes the impairment charges:
 Years Ended 31 March
(Millions of US dollars)202220212020
North America Fiber Cement$0.4 $2.0 $44.0 
Asia Pacific Fiber Cement — 15.0 
Europe Building Products — 5.5 
$0.4 $2.0 $64.5