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)

v3.22.1
Operating Segment Information and Concentrations of Risk - Summary of Operating Segments (Details) - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]      
Net sales $ 3,614.7 $ 2,908.7 $ 2,606.8
Operating income 682.6 472.8 342.5
Depreciation and amortization 161.8 135.0 131.5
Total Identifiable Assets 4,243.2 4,089.0  
Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 930.5 719.0 472.0
Total Identifiable Assets 2,622.6 2,417.3  
General Corporate      
Segment Reporting Information [Line Items]      
Operating income (247.9) (246.2) (129.5)
Depreciation and amortization 2.8 2.8 3.2
Total Identifiable Assets 1,620.6 1,671.7  
North America Fiber Cement      
Segment Reporting Information [Line Items]      
Net sales 2,551.3 2,040.2 1,816.4
North America Fiber Cement | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 741.2 585.5 429.3
Depreciation and amortization 114.4 89.1 88.7
Total Identifiable Assets 1,434.8 1,273.9  
Asia Pacific Fiber Cement      
Segment Reporting Information [Line Items]      
Net sales 574.9 458.2 418.4
Asia Pacific Fiber Cement | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 160.8 124.8 58.5
Depreciation and amortization 13.6 13.9 12.7
Total Identifiable Assets 429.1 371.0  
Europe Building Products      
Segment Reporting Information [Line Items]      
Net sales 488.5 410.3 371.4
Europe Building Products | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income 62.9 37.6 11.2
Depreciation and amortization 29.8 28.0 25.6
Total Identifiable Assets 745.2 762.1  
Other Businesses      
Segment Reporting Information [Line Items]      
Net sales 0.0 0.0 0.6
Other Businesses | Operating Segments      
Segment Reporting Information [Line Items]      
Depreciation and amortization 0.0 0.0 0.2
Research and Development | Operating Segments      
Segment Reporting Information [Line Items]      
Operating income (34.4) (28.9) (27.0)
Depreciation and amortization 1.2 1.2 $ 1.1
Total Identifiable Assets $ 13.5 $ 10.3