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)

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Operating Segment Information and Concentrations of Risk - Summary of Operating Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]      
Net sales $ 3,936.3 $ 3,777.1 $ 3,614.7
Operating income 767.4 741.4 682.6
Depreciation and amortization 185.0 172.6 161.8
Research and development expenses 47.0 39.6 38.0
Total Identifiable Assets 4,912.6 4,479.1  
Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 1,095.2 903.5 930.5
Total Identifiable Assets 3,175.0 2,979.7  
General Corporate      
Segment Reporting Information [Line Items]      
Operating income (327.8) (162.1) (247.9)
Depreciation and amortization 2.4 1.8 2.8
Total Identifiable Assets 1,737.6 1,499.4  
North America Fiber Cement      
Segment Reporting Information [Line Items]      
Net sales 2,891.4 2,787.6 2,551.3
North America Fiber Cement | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 921.1 767.5 741.2
Depreciation and amortization 133.8 126.1 114.4
Research and development expenses 8.4 5.5 5.3
Total Identifiable Assets 1,871.8 1,672.9  
Asia Pacific Fiber Cement      
Segment Reporting Information [Line Items]      
Net sales 562.8 539.2 574.9
Asia Pacific Fiber Cement | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 166.1 142.8 160.8
Depreciation and amortization 17.0 14.7 13.6
Research and development expenses 1.3 1.3 1.5
Total Identifiable Assets 434.9 509.7  
Europe Building Products      
Segment Reporting Information [Line Items]      
Net sales 482.1 450.3 488.5
Europe Building Products | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 45.0 26.5 62.9
Depreciation and amortization 29.7 28.0 29.8
Research and development expenses 3.3 1.7 0.9
Total Identifiable Assets 846.6 781.5  
Research and Development | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income (37.0) (33.3) (34.4)
Depreciation and amortization 2.1 2.0 1.2
Research and development expenses 34.0 31.1 $ 30.3
Total Identifiable Assets $ 21.7 $ 15.6