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Derivatives and Hedging Instruments - Narrative (Details) £ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2018 AUD ($) agreement | Jun. 30, 2018 USD ($) agreement | Jun. 30, 2018 GBP (£) agreement | May 08, 2018 AUD ($)
Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Number of instruments held | agreement |  |  | 2 | 2 | 2 |
Forward contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Net derivative gain (loss) included in OCI expected to be reclassified into earnings |  | $ (300,000) |  |  |  |
Gains or losses were reclassified from OCI into earnings | $ 0 | 0 |  |  |  |
Forward contracts | Derivatives Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument, notional amount |  |  |  | $ 26,400,000 |  |
Forward contracts | Derivatives Not Designated as Hedging Instruments |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument, notional amount |  |  |  |  |  | $ 176.0
Foreign currency exchange contracts |  |  |  | 6,600,000 |  |
Loss on foreign exchange forward contract |  | $ 9,300,000 |  |  |  |
Interest rate swap agreements | Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument, notional amount |  |  | $ 30.0 | 22,200,000 |  |
Interest rate cap contracts |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative instrument, notional amount |  |  |  | $ 396,200,000 | £ 300.0 |
Minimum | Derivatives Not Designated as Hedging Instruments | Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Term of contract |  | 1 year |  |  |  |
Maximum | Derivatives Not Designated as Hedging Instruments | Cash Flow Hedging |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Term of contract |  | 3 years |  |  |  |

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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 The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80845-113994 + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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