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Derivative Instruments (Tables) | 12 Months Ended
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Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Total Outstanding Notional Amount and Fair Value of Derivative Instruments | The following table sets forth the total outstanding notional amount and the fair value of the Company’s derivative instruments held at 31 March 2019 and 2018.
|  |  |  |  | Fair Value as of
(Millions of US dollars) | Notional Amount |  | 31 March 2019 |  | 31 March 2018
| 31 March 2019 |  | 31 March 2018 |  | Assets |  | Liabilities |  | Assets |  | Liabilities
Derivatives not accounted for as hedges |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contracts | $ | 75.0 |  |  | $ | 100.0 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | — |
Foreign currency forward contracts | — |  |  | 0.8 |  |  | — |  |  | — |  |  | — |  |  | — |
Total | $ | 75.0 |  |  | $ | 100.8 |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | — |

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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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