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

Revenues (Details)

v3.22.1
Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Disaggregation of Revenue [Line Items]      
Net sales $ 3,614.7 $ 2,908.7 $ 2,606.8
Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales 3,202.5 2,553.7 2,282.8
Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales 412.2 355.0 323.4
Other revenues      
Disaggregation of Revenue [Line Items]      
Net sales     0.6
North America Fiber Cement      
Disaggregation of Revenue [Line Items]      
Net sales 2,551.3 2,040.2 1,816.4
North America Fiber Cement | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales 2,551.3 2,040.2 1,816.4
North America Fiber Cement | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales 0.0 0.0 0.0
North America Fiber Cement | Other revenues      
Disaggregation of Revenue [Line Items]      
Net sales     0.0
Asia Pacific Fiber Cement      
Disaggregation of Revenue [Line Items]      
Net sales 574.9 458.2 418.4
Asia Pacific Fiber Cement | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales 574.9 458.2 418.4
Asia Pacific Fiber Cement | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales 0.0 0.0 0.0
Asia Pacific Fiber Cement | Other revenues      
Disaggregation of Revenue [Line Items]      
Net sales     0.0
Europe Building Products      
Disaggregation of Revenue [Line Items]      
Net sales 488.5 410.3 371.4
Europe Building Products | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales 76.3 55.3 48.0
Europe Building Products | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales 412.2 355.0 323.4
Europe Building Products | Other revenues      
Disaggregation of Revenue [Line Items]      
Net sales     0.0
Other Businesses      
Disaggregation of Revenue [Line Items]      
Net sales $ 0.0 $ 0.0 0.6
Other Businesses | Fiber cement revenues      
Disaggregation of Revenue [Line Items]      
Net sales     0.0
Other Businesses | Fiber gypsum revenues      
Disaggregation of Revenue [Line Items]      
Net sales     0.0
Other Businesses | Other revenues      
Disaggregation of Revenue [Line Items]      
Net sales     $ 0.6