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Derivative Instruments (Tables) | 12 Months Ended
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Mar. 31, 2015
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 2015 and 2014.
|  |  |  |  |  |  |  |  |  |  | Fair Value as of |  |  |  |
(Millions of US dollars) |  | Notional Amount |  |  | 31 March 2015 |  |  | 31 March 2014 |
|  | 31 March 2015 |  |  | 31 March 2014 |  |  | Assets |  |  | Liabilities |  |  | Assets |  |  | Liabilities |
Derivatives accounted for as hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency forward contracts |  | $ | - |  |  | $ | 9.7 |  |  | $ | - |  |  | $ | - |  |  | $ | 0.5 |  |  | $ | - |
Derivatives not accounted for as hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swap contracts |  |  | 125.0 |  |  |  | 125.0 |  |  |  | - |  |  |  | 3.1 |  |  |  | - |  |  |  | 0.5 |
Foreign currency forward contracts |  |  | 3.6 |  |  |  | 124.0 |  |  |  | - |  |  |  | 0.2 |  |  |  | 1.8 |  |  |  | - |
Total |  | $ | 128.6 |  |  | $ | 258.7 |  |  | $ | - |  |  | $ | 3.3 |  |  | $ | 2.3 |  |  | $ | 0.5 |

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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5579245-113959 + Details
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