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

Revenues (Details)

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Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Disaggregation of Revenue [Line Items]      
Total revenues $ 3,936.3 $ 3,777.1 $ 3,614.7
Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 3,531.2 3,395.4 3,202.5
Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 405.1 381.7 412.2
North America Fiber Cement      
Disaggregation of Revenue [Line Items]      
Total revenues 2,891.4 2,787.6 2,551.3
North America Fiber Cement | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 2,891.4 2,787.6 2,551.3
North America Fiber Cement | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 0.0 0.0 0.0
Asia Pacific Fiber Cement      
Disaggregation of Revenue [Line Items]      
Total revenues 562.8 539.2 574.9
Asia Pacific Fiber Cement | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 562.8 539.2 574.9
Asia Pacific Fiber Cement | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 0.0 0.0 0.0
Europe Building Products      
Disaggregation of Revenue [Line Items]      
Total revenues 482.1 450.3 488.5
Europe Building Products | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Total revenues 77.0 68.6 76.3
Europe Building Products | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Total revenues $ 405.1 $ 381.7 $ 412.2