United States Tax Cuts and Jobs Act 2017, Reclassification from AOCI to Retained Earnings

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Amount of tax expense (benefit) for adjustments from accumulated other comprehensive income (AOCI) for gain (loss) from increase (decrease) in value of excluded component of derivative designated and qualifying as hedge. Adjustments include, but are not limited to, reclassifications for sale and settlement, and amounts recognized under systematic and rational method.

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Accumulated Other Comprehensive Income/(Loss) AOCI Attributable to G&W (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income/(loss), beginning balance			$ (146,456,000)			$ (105,534,000)	$ (146,456,000)	$ (105,534,000)
Other comprehensive income/(loss) before reclassifications							(81,638,000)	(26,469,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax (provision)/benefit							(2,014,000)	(103,000)
Current period change in OCI							(83,652,000)	(26,572,000)
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings						0
Accumulated other comprehensive income/(loss), ending balance	$ (230,108,000)			$ (135,076,000)			(230,108,000)	(135,076,000)
Other Comprehensive Income (Loss), Derivative, Excluded Component, Increase (Decrease), Adjustments, Tax							(26,000)	0
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income/(loss), beginning balance			(144,503,000)			(74,617,000)	(144,503,000)	(74,617,000)
Other comprehensive income/(loss) before reclassifications							(24,026,000)	(41,395,000)
Amounts reclassified from accumulated other comprehensive loss, net of tax (provision)/benefit							82,000	0
Current period change in OCI							(23,944,000)	(41,395,000)
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings								0
Accumulated other comprehensive income/(loss), ending balance	(168,447,000)			(116,012,000)			(168,447,000)	(116,012,000)
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income/(loss), beginning balance			11,120,000			(19,601,000)	11,120,000	(19,601,000)
Other comprehensive income/(loss) before reclassifications							0	0
Amounts reclassified from accumulated other comprehensive loss, net of tax (provision)/benefit							(94,000)	129,000
Current period change in OCI							(94,000)	129,000
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings								(132,000)
Accumulated other comprehensive income/(loss), ending balance	11,026,000			(19,604,000)			11,026,000	(19,604,000)
Tax benefit/(provision) on amounts reclassified from AOCI for defined benefit plans							74,000	(42,000)
Accumulated Gain (Loss), Net, Hedges, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive income/(loss), beginning balance			(13,073,000)			(11,316,000)	(13,073,000)	(11,316,000)
Other comprehensive income/(loss) before reclassifications							(57,612,000)	14,926,000
Amounts reclassified from accumulated other comprehensive loss, net of tax (provision)/benefit							(2,002,000)	(232,000)
Current period change in OCI							(59,614,000)	14,694,000
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings								(2,838,000)
Accumulated other comprehensive income/(loss), ending balance	(72,687,000)			540,000			(72,687,000)	540,000
Tax (provision)/benefit on amounts reclassified from AOCL for hedges							593,000	76,000
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Current period change in OCI	$ (56,311,000)	$ (20,352,000)	$ (6,989,000)	$ 594,000	$ (37,511,000)	$ 10,345,000
United States Tax Cuts and Jobs Act 2017, Reclassification from AOCL to Retained Earnings								$ (2,970,000)
Interest Expense [Member] \| Accumulated Gain (Loss), Net, Hedges, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive loss, net of tax (provision)/benefit							(1,700,000)
Other income/(loss), net [Member] \| Accumulated Gain (Loss), Net, Hedges, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amounts reclassified from accumulated other comprehensive loss, net of tax (provision)/benefit							$ (300,000)