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v3.19.1

Property, Plant and Equipment (Tables) | 12 Months Ended
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Mar. 31, 2019
Property, Plant and Equipment [Abstract] |
Components of Property, Plant and Equipment | Property, plant and equipment consist of the following components:
(Millions of US dollars) Cost or valuation: | Land |  | Buildings |  | Machinery and Equipment |  | Construction in Progress 1 |  | Total
At 31 March 2017 | $ | 69.5 |  |  | $ | 344.5 |  |  | $ | 1,175.7 |  |  | $ | 56.6 |  |  | $ | 1,646.3 |
Additions 2 | — |  |  | 7.9 |  |  | 83.8 |  |  | 126.1 |  |  | 217.8 |
Disposals 3 | (1.4 | ) |  | (5.6 | ) |  | (24.3 | ) |  | (3.6 | ) |  | (34.9 | )
Exchange differences | 0.1 |  |  | — |  |  | 0.9 |  |  | (0.2 | ) |  | 0.8 |
At 31 March 2018 | $ | 68.2 |  |  | $ | 346.8 |  |  | $ | 1,236.1 |  |  | $ | 178.9 |  |  | $ | 1,830.0 |
Additions | 1.6 |  | 58.9 |  | 203.6 |  | 76.7 |  | 340.8 |
Acquisitions | 19.2 |  | 44.1 |  |  | 159.5 |  |  | 7.5 |  |  | 230.3 |
Transfers 4 | — |  |  | (6.0 | ) |  | 2.2 |  |  | (6.5 | ) |  | (10.3 | )
Disposals 3 | (0.2 | ) |  | (5.9 | ) |  | (48.1 | ) |  | (1.2 | ) |  | (55.4 | )
Exchange differences | (5.0 | ) |  | (5.1 | ) |  | (45.7 | ) |  | 1.8 |  |  | (54.0 | )
At 31 March 2019 | $ | 83.8 |  |  | $ | 432.8 |  |  | $ | 1,507.6 |  |  | $ | 257.2 |  |  | $ | 2,281.4 |
Accumulated depreciation: |  |  |  |  |  |  |  |  |
At 31 March 2017 | $ | — |  |  | $ | (128.0 | ) |  | $ | (639.3 | ) |  | $ | — |  |  | $ | (767.3 | )
Charge for the year | — |  |  | (11.3 | ) |  | (77.6 | ) |  | — |  |  | (88.9 | )
Disposals 3 | — |  |  | 1.9 |  |  | 16.6 |  |  | — |  |  | 18.5 |
Exchange differences | — |  |  | — |  |  | (0.2 | ) |  | — |  |  | (0.2 | )
At 31 March 2018 | $ | — |  |  | $ | (137.4 | ) |  | $ | (700.5 | ) |  | $ | — |  |  | $ | (837.9 | )
Charge for the year | — |  |  | (14.6 | ) |  | (95.0 | ) |  | — |  |  | (109.6 | )
Transfers 4 | — |  |  | 0.8 |  |  | 3.7 |  |  | — |  |  | 4.5 |
Disposals 3 | — |  |  | 4.1 |  |  | 23.3 |  |  | — |  |  | 27.4 |
Exchange differences | — |  |  | 3.2 |  |  | 19.4 |  |  | — |  |  | 22.6 |
At 31 March 2019 | $ | — |  |  | $ | (143.9 | ) |  | $ | (749.1 | ) |  | $ | — |  |  | $ | (893.0 | )
Net book amount: |  |  |  |  |  |  |  |  |
At 31 March 2018 | $ | 68.2 |  |  | $ | 209.4 |  |  | $ | 535.6 |  |  | $ | 178.9 |  |  | $ | 992.1 |
At 31 March 2019 | $ | 83.8 |  |  | $ | 288.9 |  |  | $ | 758.5 |  |  | $ | 257.2 |  |  | $ | 1,388.4 |
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1 | Construction in progress is presented net of assets transferred into service.
2 | Additions include US$5.4 million and US$4.8 million of capitalized interest for the years ended 31 March 2019 and 2018, respectively.
3 | The US$28.0 million net book value of disposals in fiscal year 2019 includes US$13.7 million of usage of replacement parts, US$6.1 million of impairment due to the Company's decision to cease production of its fiberglass windows business, US$2.6 million of impairment related to the discontinuance of its MCT product line, US$0.4 million of impairment charges on individual assets and US$5.2 million of disposals of assets no longer in use. The US$16.4 million net book value of disposals in fiscal year 2018 includes US$13.9 million of usage of replacement parts and US$0.7 million of impairment charges on individual assets. The remaining net book value of disposals of US$1.8 million is related to the disposal of assets no longer in use.
4 | Transfers include the net book value of Property, plant and equipment, net associated with our fiberglass windows business, which was classified as held for sale at 31 March 2019. This net book value of US$5.8 million was removed from Property, plant and equipment, net and was included in the Prepaid expenses and other current assets on the consolidated balance sheets at 31 March 2019.

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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