Restructuring and Integration Expenses - Schedule of Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	$ 0	$ 8,348	$ 0	$ 36,251
Cumulative	198,912		198,912		$ 198,900
Severance costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	1,827	0	7,236
Cumulative	58,126		58,126
Facility exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	867	0	4,154
Cumulative	27,368		27,368
System consolidation costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	2,903	0	9,305
Cumulative	37,389		37,389
Legal costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	955	0	5,188
Cumulative	13,926		13,926
Tax and accounting advisory services
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	581	0	1,527
Cumulative	27,358		27,358
Other costs
Restructuring Cost and Reserve [Line Items]
Restructuring and integration expenses	0	$ 1,215	0	$ 8,841
Cumulative	$ 34,745		$ 34,745