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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Mar. 31, 2016
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | During the year ended 31 March 2016, there was US$0.3 million reclassifications out of Accumulated other comprehensive income (loss) related to pension and post-retirement adjustments.
(Millions of US dollars) |  | Pension and Post-Retirement Benefit |  |  | Cash Flow Hedges |  |  | Foreign Currency Translation |  |  | Total |
Balance at 31 March 2015 |  | $ | (0.3) |  |  | $ | 0.3 |  |  | $ | (0.4) |  |  | $ | (0.4) |
Other comprehensive loss before reclassifications |  |  | - |  |  |  | - |  |  |  | 0.9 |  |  |  | 0.9 |
Pension and post-retirement benefit adjustments |  |  | 0.3 |  |  |  | - |  |  |  | - |  |  |  | 0.3 |
Net current-period other comprehensive income |  |  | 0.3 |  |  |  | - |  |  |  | 0.9 |  |  |  | 1.2 |
Balance at 31 March 2016 |  | $ | - |  |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | 0.8 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 + Details
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