Derivative Financial Instruments - Narrative (Details) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Foreign Currency Hedges
Derivative [Line Items]
Losses reported in accumulated other comprehensive income			$ 1,000,000.0
Losses to be reclassified within next 12 months			1,000,000.0
Derivatives, net gain (loss) reclassified into cost of services	$ (600,000)	$ 400,000	(700,000)	$ 500,000
Notional amount	26,900,000		26,900,000		$ 52,600,000
Interest Rate Swap
Derivative [Line Items]
Losses reported in accumulated other comprehensive income			3,400,000
Losses to be reclassified within next 12 months			1,900,000
Derivatives, net gain (loss) reclassified into cost of services	(400,000)		(300,000)
Notional amount	$ 200,000,000.0		$ 200,000,000.0		$ 100,000,000.0