Restructuring, Integration, and Other Charges - Accrual (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - December 31, 2018	$ 25,829
Restructuring Reserve, Accrual Adjustment	(9,968)
Restructuring, integration, and other charges	89,785	$ 60,361	$ 74,588
Payments for restructuring and integration	(28,936)
Restructuring Reserve - December 31, 2019	9,667	25,829
Accrued expenses	$ 880,507	912,292
Number of Years for the Accrual to Be Spent	2 years
Restructuring Charges From Current Period [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, integration, and other charges	$ 22,256	23,698	46,816
Restructuring Charges From Prior Periods [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring, integration, and other charges	636	$ 7,517	$ 6,191
Severance Costs [Member] | Expense Reduction Program [Member]
Restructuring Cost and Reserve [Line Items]
Accrued expenses	$ 24,252
Number of Years for the Accrual to Be Spent	1 year