Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Segment reporting information profit (loss)
Revenue	$ 899,203	$ 837,492	$ 1,814,400	$ 1,633,760
Reconciliation of Segment EBIT to net income (loss):
Restructuring charges			(7,733)	(8,739)
Interest expense, net	(24,346)	(26,446)	(49,504)	(52,329)
Gain on sale of equity investment			0	11,908
Goodwill impairment	0	0	0	(198,169)
Loss on debt refinancing	(989)	0	(52,383)	(36,987)
Gain on sale of business	10,201	0	10,201	0
Gain on sale of assets	1,434	0	1,434	0
(Provision) benefit for income taxes	(4,915)	(17,016)	9,077	(6,986)
Income (loss) from continuing operations	20,876	(297)	(6,779)	(218,844)
(Loss) income from discontinued operations, net of tax	(1,020)	(3,032)	(4,906)	7,032
Net loss	19,856	(3,329)	(11,685)	(211,812)
Operating Segments
Segment reporting information profit (loss)
EBIT	112,424	97,956	219,569	190,738
Segment Reconciling Items
Reconciliation of Segment EBIT to net income (loss):
Unallocated corporate expenses	(56,316)	(49,489)	(113,781)	(93,211)
Restructuring charges	(4,844)	(4,922)	(7,733)	(8,739)
Interest expense, net	(36,119)	(38,385)	(73,163)	(76,757)
Gain on sale of equity investment	0	11,908	0	11,908
Goodwill impairment	0	0	0	(198,169)
Loss on debt refinancing	(989)	0	(52,383)	(36,987)
Gain on sale of business	10,201	0	10,201	0
Gain on sale of assets	1,434	0	1,434	0
Transaction costs	0	(349)	0	(641)
(Provision) benefit for income taxes	(4,915)	(17,016)	9,077	(6,986)
Digital Commerce Solutions | Global Ecommerce
Segment reporting information profit (loss)
Revenue from contracts with customers	418,429	398,453	831,515	690,776
EBIT	(10,831)	(18,894)	(37,207)	(48,369)
Reconciliation of Segment EBIT to net income (loss):
Goodwill impairment				(198,169)
Digital Commerce Solutions | Presort Services
Segment reporting information profit (loss)
Revenue from contracts with customers	134,619	118,127	277,745	258,847
EBIT	16,134	12,582	35,185	28,277
Reconciliation of Segment EBIT to net income (loss):
Goodwill impairment				0
SendTech Solutions
Segment reporting information profit (loss)
Revenue from contracts with customers	346,155	320,912	705,140	684,137
Reconciliation of Segment EBIT to net income (loss):
Goodwill impairment				0
SendTech Solutions | Operating Segments
Segment reporting information profit (loss)
EBIT	$ 107,121	$ 104,268	$ 221,591	$ 210,830