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Derivatives and Fair Value Measurements - Texutals (Details) $ in Millions, $ in Millions | Dec. 31, 2018 $ / $ | Mar. 31, 2018 AUD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
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Successor | Foreign currency forward contract |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, notional amount |  | $ 1,125.0 |  |
Successor | Fair Value, Measurements, Recurring |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | $ 2.3 | $ 4.2
Successor | Fair Value, Measurements, Recurring | Foreign currency forward contract |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative Assets (Liabilities), at Fair Value, Net |  |  | $ 2.3 | $ 4.2
Scenario, Forecast | Lower rate | Foreign currency forward contract |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Exchange Rate Cap | $ / $ | 0.8150 |  |  |
Scenario, Forecast | Higher rate | Foreign currency forward contract |  |  |  |
Derivatives, Fair Value [Line Items] |  |  |  |
Derivative, Exchange Rate Cap | $ / $ | 0.82 |  |  |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Cap rate on a foreign currency derivative for example, but not limited to, a cap or a collar. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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