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

Operating Segment Information and Concentrations of Risk - Summary of Additional Geographical Information (Details)

v3.23.1
Operating Segment Information and Concentrations of Risk - Summary of Additional Geographical Information (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]      
Selling, general and administrative expenses $ 494.0 $ 461.2 $ 389.6
Research and development costs 39.6 38.0 34.3
North America Fiber Cement      
Segment Reporting Information [Line Items]      
Research and development costs 5.5 5.3 5.6
Asia Pacific Fiber Cement      
Segment Reporting Information [Line Items]      
Research and development costs 1.3 1.5 1.1
Europe Building Products      
Segment Reporting Information [Line Items]      
Research and development costs 1.7 0.9 1.6
Research and Development      
Segment Reporting Information [Line Items]      
Selling, general and administrative expenses 2.2 4.1 2.9
Research and development costs $ 31.1 $ 30.3 $ 26.0