Goodwill and Other Intangible Assets - Rollforward of Goodwill (Details) - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 31, 2020 |
Mar. 31, 2019 |
|
| Goodwill [Roll Forward] | ||
| Balance, beginning | $ 201.1 | $ 4.9 |
| Acquired | 220.0 | |
| Impairment | (0.2) | (4.6) |
| Foreign exchange impact | (4.0) | (19.2) |
| Balance, ending | 196.9 | 201.1 |
| Europe Building Products | ||
| Goodwill [Roll Forward] | ||
| Balance, beginning | 200.8 | 0.0 |
| Acquired | 220.0 | |
| Impairment | 0.0 | 0.0 |
| Foreign exchange impact | (3.9) | (19.2) |
| Balance, ending | 196.9 | 200.8 |
| Asia Pacific | ||
| Goodwill [Roll Forward] | ||
| Balance, beginning | 0.3 | 0.3 |
| Acquired | 0.0 | |
| Impairment | (0.2) | 0.0 |
| Foreign exchange impact | (0.1) | 0.0 |
| Balance, ending | 0.0 | 0.3 |
| Other Businesses | ||
| Goodwill [Roll Forward] | ||
| Balance, beginning | 0.0 | 4.6 |
| Acquired | 0.0 | |
| Impairment | 0.0 | (4.6) |
| Foreign exchange impact | 0.0 | 0.0 |
| Balance, ending | $ 0.0 | $ 0.0 |
| X | ||||||||||
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|