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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Mar. 31, 2021
Equity [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated other comprehensive loss is comprised of the following at 31 March 2021:
(Millions of US dollars) |  | Cash Flow Hedges |  | Pension Actuarial Gain |  | Foreign Currency Translation Adjustments |  | Total
Balance at 31 March 2020 |  | $ | 0.2 |  |  | $ | 0.8 |  |  | $ | (63.1) |  |  | $ | (62.1) |
Other comprehensive (loss) gain |  | — |  |  | (0.4) |  |  | 55.9 |  |  | 55.5 |
Balance at 31 March 2021 |  | $ | 0.2 |  |  | $ | 0.4 |  |  | $ | (7.2) |  |  | $ | (6.6) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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