Business Combinations - Pro Forma Information (Details) - Fermacell - USD ($) $ in Millions |
12 Months Ended | |
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Mar. 31, 2019 |
Mar. 31, 2018 |
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| Business Acquisition [Line Items] | ||
| Net sales | $ 2,506.6 | $ 2,367.0 |
| Income before income taxes | 329.7 | 203.6 |
| Europe Building Products | ||
| Business Acquisition [Line Items] | ||
| Net sales | 368.3 | 348.8 |
| Income before income taxes | $ 39.1 | $ 29.0 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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