Restructuring, Integration, and Other Charges - Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - December 31, 2019	$ 9,667
Restructuring, integration, and other charges	13,288	$ 89,785	$ 60,361
Payments for restructuring and integration	(12,619)
Restructuring Reserve - December 31, 2020	9,735	9,667
Accrued expenses	$ 1,034,361	880,507
Number of Years for the Accrual to Be Spent	1 year
Restructuring Charges From Current Period [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, integration, and other charges	$ 13,389	22,256	23,698
Restructuring Charges From Prior Periods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, integration, and other charges	$ (633)	636	$ 7,517
Employee Severance [Member] | Expense Reduction Program [Member]
Restructuring Cost and Reserve [Line Items]
Accrued expenses		$ 24,252