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Accumulated Other Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Mar. 31, 2017
Equity [Abstract] |
Accumulated Other Comprehensive Income (Loss) | During the year ended 31 March 2017 there were no reclassifications out of Accumulated other comprehensive income (loss):
(Millions of US dollars) |  | Cash Flow Hedges |  |  | Foreign Currency Translation Adjustments |  |  | Total |
Balance at 31 March 2016 |  | $ | 0.3 |  |  | $ | 0.5 |  |  | $ | 0.8 |
Other comprehensive loss |  |  | - |  |  |  | (3.0) |  |  |  | (3.0) |
Balance at 31 March 2017 |  | $ | 0.3 |  |  | $ | (2.5) |  |  | $ | (2.2) |

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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=66004124&loc=SL7669686-108580 + Details
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