Project Summit - Restructuring Rollforward (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended	18 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020	Mar. 31, 2021
Restructuring Reserve [Roll Forward]
Amounts accrued	$ 39,811	$ 41,046		$ 282,804
Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance	40,053	17,777	$ 17,777
Amounts accrued	39,811		194,396
Payments	(30,936)		(168,677)
Other, including currency translation adjustments	(220)		(3,443)
Ending balance	48,708		40,053	48,708
Employee severance costs
Restructuring Reserve [Roll Forward]
Amounts accrued	3,808	6,108		72,007
Employee severance costs | Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance	16,278	4,823	4,823
Amounts accrued	3,808		47,349
Payments	(17,087)		(32,455)
Other, including currency translation adjustments	(220)		(3,439)
Ending balance	2,779		16,278	2,779
Professional fees and other costs
Restructuring Reserve [Roll Forward]
Amounts accrued	36,003	34,938		210,797
Professional fees and other costs | Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance	23,775	$ 12,954	12,954
Amounts accrued	36,003		147,047
Payments	(13,849)		(136,222)
Other, including currency translation adjustments	0		(4)
Ending balance	$ 45,929		$ 23,775	$ 45,929