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

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

v3.23.1
Operating Segment Information and Concentrations of Risk - Summary of Operating Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]      
Net sales $ 3,777.1 $ 3,614.7 $ 2,908.7
Operating income 741.4 682.6 472.8
Depreciation and amortization 172.6 161.8 135.0
Total Identifiable Assets 4,479.1 4,243.2  
Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 903.5 930.5 719.0
Total Identifiable Assets 2,979.7 2,622.6  
General Corporate      
Segment Reporting Information [Line Items]      
Operating income (162.1) (247.9) (246.2)
Depreciation and amortization 1.8 2.8 2.8
Total Identifiable Assets 1,499.4 1,620.6  
North America Fiber Cement      
Segment Reporting Information [Line Items]      
Net sales 2,787.6 2,551.3 2,040.2
North America Fiber Cement | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 767.5 741.2 585.5
Depreciation and amortization 126.1 114.4 89.1
Total Identifiable Assets 1,672.9 1,434.8  
Asia Pacific Fiber Cement      
Segment Reporting Information [Line Items]      
Net sales 539.2 574.9 458.2
Asia Pacific Fiber Cement | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 142.8 160.8 124.8
Depreciation and amortization 14.7 13.6 13.9
Total Identifiable Assets 509.7 429.1  
Europe Building Products      
Segment Reporting Information [Line Items]      
Net sales 450.3 488.5 410.3
Europe Building Products | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 26.5 62.9 37.6
Depreciation and amortization 28.0 29.8 28.0
Total Identifiable Assets 781.5 745.2  
Research and Development | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income (33.3) (34.4) (28.9)
Depreciation and amortization 2.0 1.2 $ 1.2
Total Identifiable Assets $ 15.6 $ 13.5