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

Property, Plant and Equipment - Additional Information (Details)

v3.21.1
Property, Plant and Equipment - Additional Information (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
plant
Mar. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 129.6 $ 125.4 $ 109.6
Restructuring expenses 0.0 77.4 15.9
Property, plant and equipment, net 1,372.3 1,341.7  
Other impairment charges   1.2  
Shut Down of Summerville, South Carolina Facility      
Property, Plant and Equipment [Line Items]      
Impairment charges related to decision to shut down facility   12.0  
Impairment charge, difference between carrying value and fair value   22.1  
Costs to sell   10.1  
Non-Core Assets      
Property, Plant and Equipment [Line Items]      
Impairment charges related to decision to shut down facility   $ 29.2  
Number of plants | plant   4  
North America Fiber Cement      
Property, Plant and Equipment [Line Items]      
Restructuring expenses   $ 41.2 2.6
North America Fiber Cement | Cost of Sales      
Property, Plant and Equipment [Line Items]      
Other impairment charges $ 2.0 2.8 0.4
Asia Pacific Fiber Cement | Penrose Plant Assets      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, net   2.6  
Asia Pacific Fiber Cement | Exit of Business      
Property, Plant and Equipment [Line Items]      
Restructuring expenses   14.0  
Impairment charges related to decision to shut down facility   1.0  
Europe Building Products | Non-Core Assets      
Property, Plant and Equipment [Line Items]      
Restructuring expenses   $ 5.5  
Other Businesses      
Property, Plant and Equipment [Line Items]      
Restructuring expenses     $ 6.1