Project Summit - Restructuring Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended			15 Months Ended
	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Restructuring Cost and Reserve [Line Items]
Amounts accrued		$ 194,396	$ 48,597	$ 0	$ 242,993
Project Summit Costs
Restructuring Cost and Reserve [Line Items]
Beginning balance	$ 0	17,777			0
Amounts accrued	48,597	194,396
Payments	(30,820)	(168,677)
Other, including currency translation adjustments	0	3,443
Ending balance	17,777	40,053	17,777		40,053
Employee severance costs
Restructuring Cost and Reserve [Line Items]
Amounts accrued		47,349	20,850		68,199
Employee severance costs | Project Summit Costs
Restructuring Cost and Reserve [Line Items]
Beginning balance	0	4,823			0
Amounts accrued	20,850	47,349
Payments	(16,027)	(32,455)
Other, including currency translation adjustments	0	3,439
Ending balance	4,823	16,278	4,823		16,278
Professional fees and other costs
Restructuring Cost and Reserve [Line Items]
Amounts accrued		147,047	27,747		174,794
Professional fees and other costs | Project Summit Costs
Restructuring Cost and Reserve [Line Items]
Beginning balance	0	12,954			0
Amounts accrued	27,747	147,047
Payments	(14,793)	(136,222)
Other, including currency translation adjustments	0	4
Ending balance	$ 12,954	$ 23,775	$ 12,954		$ 23,775