Shareholders' Equity - AOCI Reclassifications (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net revenue	$ 774,269	$ 870,499
Cost of revenue	566,406	580,806
Other, net	(12,281)	3,189
Income before taxes	6,915	106,532
(Benefit from)/provision for income taxes	1,516	(21,467)
Net income	8,431	85,065
(Gain)/Loss Reclassified from Accumulated Other Comprehensive Loss | Derivative instruments designated and qualifying as cash flow hedges:
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income before taxes	(8,391)	(3,347)
(Benefit from)/provision for income taxes	2,098	686
Net income	(6,293)	(2,661)
(Gain)/Loss Reclassified from Accumulated Other Comprehensive Loss | Derivative instruments designated and qualifying as cash flow hedges: | Foreign currency forward contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net revenue	(6,623)	(3,219)
Cost of revenue	(1,768)	(128)
(Gain)/Loss Reclassified from Accumulated Other Comprehensive Loss | Defined benefit and retiree healthcare plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other, net	4,369	123
(Benefit from)/provision for income taxes	(1,027)	(40)
Net income	$ 3,342	$ 83