Project Summit - Restructuring Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended	21 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020	Jun. 30, 2021
Restructuring Reserve [Roll Forward]
Amounts accrued	$ 39,443	$ 39,298	$ 79,254	$ 80,344		$ 322,247
Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance			40,053	17,777	$ 17,777
Amounts accrued			79,254		194,396
Payments			(85,854)		(168,677)
Other, including currency translation adjustments			(384)		(3,443)
Ending balance	33,069		33,069		40,053	33,069
Employee severance costs
Restructuring Reserve [Roll Forward]
Amounts accrued	3,921	11,542	7,729	17,650		75,928
Employee severance costs | Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance			16,278	4,823	4,823
Amounts accrued			7,729		47,349
Payments			(16,474)		(32,455)
Other, including currency translation adjustments			(384)		(3,439)
Ending balance	7,149		7,149		16,278	7,149
Professional fees and other costs
Restructuring Reserve [Roll Forward]
Amounts accrued	35,522	$ 27,756	71,525	62,694		246,319
Professional fees and other costs | Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance			23,775	$ 12,954	12,954
Amounts accrued			71,525		147,047
Payments			(69,380)		(136,222)
Other, including currency translation adjustments			0		(4)
Ending balance	$ 25,920		$ 25,920		$ 23,775	$ 25,920