Project Summit - Restructuring Rollforward (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended	24 Months Ended
	Oct. 31, 2019	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Sep. 30, 2021
Restructuring Reserve [Roll Forward]
Amounts accrued		$ 50,432	$ 48,371	$ 129,686	$ 128,715		$ 372,679
Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance				40,053	17,777	$ 17,777
Amounts accrued	$ 450,000			129,686		194,396
Payments				(133,485)		(168,677)
Other, including currency translation adjustments				(939)		(3,443)
Ending balance		35,315		35,315		40,053	35,315
Employee severance costs
Restructuring Reserve [Roll Forward]
Amounts accrued		6,797	13,579	14,526	31,229		82,725
Employee severance costs | Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance				16,278	4,823	4,823
Amounts accrued				14,525		47,349
Payments				(20,771)		(32,455)
Other, including currency translation adjustments				(939)		(3,439)
Ending balance		9,093		9,093		16,278	9,093
Professional fees and other costs
Restructuring Reserve [Roll Forward]
Amounts accrued		43,635	$ 34,792	115,160	97,486		289,954
Professional fees and other costs | Project Summit costs
Restructuring Reserve [Roll Forward]
Beginning balance				23,775	$ 12,954	12,954
Amounts accrued				115,161		147,047
Payments				(112,714)		(136,222)
Other, including currency translation adjustments				0		(4)
Ending balance		$ 26,222		$ 26,222		$ 23,775	$ 26,222