Restructuring and Integration Expenses - Schedule of Restructuring Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	$ 0	$ 45,960	$ 87,307
Cumulative		198,912
Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	9,487	18,326
Cumulative		58,126
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	6,532	13,519
Cumulative		27,368
System consolidation costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	11,603	20,859
Cumulative		37,389
Legal costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	5,550	3,956
Cumulative		13,926
Tax and accounting advisory services
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	$ 0	1,918	14,851
Cumulative		27,358
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses		10,870	$ 15,796
Cumulative		$ 34,745