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Financial Instruments (Tables) | 12 Months Ended
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Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Outstanding Forward Foreign Exchange Contracts | As of March 31, 2018, the Company had the following outstanding forward foreign exchange contracts (all outstanding contracts have maturities of less than 18 months from March 31, 2018):
March 31, 2018
Foreign Currency |  | Foreign Currency Amount |  | US Dollar Amount |  | Weighted Average Exchange Rate Per $1 USD
|  | (Amounts in millions) |  | (Amounts in millions) |  |
British Pound Sterling |  |  | £20.8 |  | in exchange for |  | $29.0 |  |  | £0.72
Euro |  |  | €1.5 |  | in exchange for |  | $1.7 |  |  | €0.87
Canadian Dollar |  |  | C$15.1 |  | in exchange for |  | $12.1 |  |  | C$1.25
Australian Dollar |  |  | A$4.1 |  | in exchange for |  | $3.2 |  |  | A$1.27
Schedule of Derivative Instruments, Statements of Financial Performance And Comprehensive Income, Location And Effect [Table Text Block] | The following table presents the effect of the Company's foreign currency derivatives on the accompanying consolidated statements of income and comprehensive income for the years ended March 31, 2018, 2017 and 2016:
| Year Ended
| March 31,
| 2018 |  | 2017 |  | 2016
| (Amounts in millions)
Forward exchange contracts designated as cash flow hedges |  |  |  |  |
Loss recognized in accumulated other comprehensive income (loss) | $ | (0.2 | ) |  | $ | (3.5 | ) |  | $ | (0.2 | )
Gain (loss) reclassified from accumulated other comprehensive income (loss) into direct operating expense | $ | (1.5 | ) |  | $ | 5.0 |  |  | $ | — |
Forward exchange contracts not designated as cash flow hedges |  |  |  |  |
Gain recognized in direct operating expense | $ | 0.1 |  |  | $ | — |  |  | $ | 1.3 |
Total direct operating expense on consolidated statements of income | $ | 2,309.6 |  |  | $ | 1,903.8 |  |  | $ | 1,415.3 |
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] | As of March 31, 2018 and March 31, 2017, the Company had the following amounts recorded in the accompanying consolidated balance sheets related to the Company's use of foreign currency derivatives:
|  | March 31, 2018 |  | March 31, 2017
|  | (Amounts in millions)
Other current assets(1) |  | $ | 0.3 |  |  | $ | 0.6 |
Accounts payable and accrued liabilities(1) |  | 0.6 |  |  | 0.5 |
_____________
(1) | Includes an immaterial amount of forward foreign exchange contracts not designated as hedging instruments as of March 31, 2018 and 2017.

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- Definition Tabular disclosure of (1) the location and amount of gains and losses reported in the statement of financial performance for derivative instruments not designated as hedging activities (2) the effective portion of the gains and losses on derivative instruments designated as hedging activities recognized in other comprehensive income (loss) during the period and (3) the amount and location of the amount reclassified from accumulated other comprehensive income (loss) during the period to the statement of financial performance. + References No definition available. + Details
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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41641-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41678-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41638-113959 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5580258-113959 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579245-113959 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624171-113959 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5579240-113959 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84234895&loc=d3e41620-113959 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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