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, 2023
Mar. 31, 2022
Mar. 31, 2021
Disaggregation of Revenue [Line Items]      
Net sales $ 3,777.1 $ 3,614.7 $ 2,908.7
Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales 3,395.4 3,202.5 2,553.7
Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales 381.7 412.2 355.0
North America Fiber Cement      
Disaggregation of Revenue [Line Items]      
Net sales 2,787.6 2,551.3 2,040.2
North America Fiber Cement | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales 2,787.6 2,551.3 2,040.2
North America Fiber Cement | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales 0.0 0.0 0.0
Asia Pacific Fiber Cement      
Disaggregation of Revenue [Line Items]      
Net sales 539.2 574.9 458.2
Asia Pacific Fiber Cement | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales 539.2 574.9 458.2
Asia Pacific Fiber Cement | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales 0.0 0.0 0.0
Europe Building Products      
Disaggregation of Revenue [Line Items]      
Net sales 450.3 488.5 410.3
Europe Building Products | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales 68.6 76.3 55.3
Europe Building Products | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales $ 381.7 $ 412.2 $ 355.0