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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

X

- 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

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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
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The number of derivative instruments of a particular group held by the entity.

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-Topic 815
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-Section 50
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Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value portion of liability contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward (delivery or nondelivery) contracts, and swaps entered into.

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Amount of net gain (loss) recognized in earnings when a hedged firm commitment no longer qualifies as a fair value hedge.

+ References

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Amount of gain (loss) from the increase (decrease) in fair value of foreign currency derivatives and nonderivative instruments designated as fair value hedging instruments which were recognized in earnings, net of offsets by the gain (loss) on the hedged item to the extent that the fair value hedge was determined to be effective.

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