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Revenues Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | $ 2,506.6 | $ 2,054.5 | $ 1,921.6
Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 2,159.5 | 2,039.8 | 1,905.2
Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 332.5 | 0.0 | 0.0
Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 14.6 | 14.7 | 16.4
North America Fiber Cement |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 1,676.9 | 1,578.1 | 1,493.4
North America Fiber Cement | Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 1,676.9 | 1,578.1 | 1,493.4
North America Fiber Cement | Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
North America Fiber Cement | Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Asia Pacific Fiber Cement |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 446.8 | 425.4 | 370.6
Asia Pacific Fiber Cement | Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 446.8 | 425.4 | 370.6
Asia Pacific Fiber Cement | Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Asia Pacific Fiber Cement | Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Europe Building Products |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 368.3 | 36.3 | 41.2
Europe Building Products | Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 35.8 | 36.3 | 41.2
Europe Building Products | Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 332.5 | 0.0 | 0.0
Europe Building Products | Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other Businesses |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 14.6 | 14.7 | 16.4
Other Businesses | Fiber cement revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other Businesses | Fiber gypsum revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | 0.0 | 0.0 | 0.0
Other Businesses | Other revenues |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |
Net sales | $ 14.6 | $ 14.7 | $ 16.4

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