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Property, Plant and Equipment (Tables) | 12 Months Ended
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Mar. 31, 2016
Property, Plant and Equipment [Abstract] |
Components of Property, Plant and Equipment | Property, plant and equipment consist of the following components:
|  |  |  |  |  |  |  | Machinery |  |  | Construction |  |  |  |
(Millions of US dollars) |  |  |  |  |  |  |  | and |  |  | in |  |  |  |
Cost or valuation: |  | Land |  |  | Buildings |  |  | Equipment |  |  | Progress 1 |  |  | Total |
At 31 March 2014 |  | $ | 28.7 |  |  | $ | 212.5 |  |  | $ | 961.1 |  |  | $ | 115.4 |  |  | $ | 1,317.7 |
Additions 2 |  |  | 41.5 |  |  |  | 30.2 |  |  |  | 72.7 |  |  |  | 133.5 |  |  |  | 277.9 |
Disposals 3 |  |  | - |  |  |  | (1.7) |  |  |  | (6.6) |  |  |  | - |  |  |  | (8.3) |
Exchange differences |  |  | - |  |  |  | (1.2) |  |  |  | (52.6) |  |  |  | - |  |  |  | (53.8) |
At 31 March 2015 |  | $ | 70.2 |  |  | $ | 239.8 |  |  | $ | 974.6 |  |  | $ | 248.9 |  |  | $ | 1,533.5 |
Additions 2 |  |  | - |  |  |  | 27.0 |  |  |  | 155.5 |  |  |  | (103.9) |  |  |  | 78.6 |
Disposals 4 |  |  | - |  |  |  | (0.7) |  |  |  | (65.8) |  |  |  | (1.5) |  |  |  | (68.0) |
Exchange differences |  |  | (0.1) |  |  |  | (0.1) |  |  |  | (1.9) |  |  |  | - |  |  |  | (2.1) |
At 31 March 2016 |  | $ | 70.1 |  |  | $ | 266.0 |  |  | $ | 1,062.4 |  |  | $ | 143.5 |  |  | $ | 1,542.0 |
Accumulated depreciation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At 31 March 2014 |  | $ | - |  |  | $ | (80.9) |  |  | $ | (534.0) |  |  | $ | - |  |  | $ | (614.9) |
Charge for the year |  |  | - |  |  |  | (9.3) |  |  |  | (60.9) |  |  |  | - |  |  |  | (70.2) |
Disposals 3 |  |  | - |  |  |  | 0.8 |  |  |  | 6.3 |  |  |  | - |  |  |  | 7.1 |
Exchange differences |  |  | - |  |  |  | 1.2 |  |  |  | 23.4 |  |  |  | - |  |  |  | 24.6 |
At 31 March 2015 |  | $ | - |  |  | $ | (88.2) |  |  | $ | (565.2) |  |  | $ | - |  |  | $ | (653.4) |
Charge for the year |  |  |  |  |  |  | (10.7) |  |  |  | (65.6) |  |  |  | - |  |  |  | (76.3) |
Disposals 4 |  |  | - |  |  |  | 0.5 |  |  |  | 51.1 |  |  |  | - |  |  |  | 51.6 |
Exchange differences |  |  | - |  |  |  | 0.2 |  |  |  | 2.9 |  |  |  | - |  |  |  | 3.1 |
At 31 March 2016 |  | $ | - |  |  | $ | (98.2) |  |  | $ | (576.8) |  |  | $ | - |  |  | $ | (675.0) |
Net book amount: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
At 31 March 2015 |  | $ | 70.2 |  |  | $ | 151.6 |  |  | $ | 409.4 |  |  | $ | 248.9 |  |  | $ | 880.1 |
At 31 March 2016 |  | $ | 70.1 |  |  | $ | 167.8 |  |  | $ | 485.6 |  |  | $ | 143.5 |  |  | $ | 867.0 |
1 | Construction in progress is presented net of assets transferred into service.
2 | Additions include US$3.2 million and US$1.7 million of capitalized interest for the years ended 31 March 2016 and 2015, respectively.
3 | This includes the accounting impact associated with the purchase of the Company’s previously leased facility at Rosehill.
4 | The US$16.4 million net book value of disposals include US$10.9 million of usage of replacement parts and US$3.5 million of impairment charges on individual assets. The remaining net book value of disposals of US$2.0 million is related to the disposal of assets no longer in use, and do not represent a sale of assets.

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph b -Article 5 + Details
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