Segment Information (Net (Loss) Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Reconciliation of Adjusted Segment EBIT to net (loss) income:
Restructuring charges	$ (3,599)	$ (4,184)
Interest expense, net	(22,342)	(22,124)
Gain (loss) on debt redemption/refinancing	2,836	(4,993)
Gain on sale of businesses, including transaction costs	0	14,372
Gain (loss) on sale of business	0	2,522
Benefit (provision) for income taxes	3,250	(4,203)
Net (loss) income	(7,737)	20,821
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBIT	89,370	110,511
Segment Reconciling Items
Reconciliation of Adjusted Segment EBIT to net (loss) income:
Unallocated corporate expenses	(56,349)	(57,834)
Restructuring charges	(3,599)	(4,184)
Interest expense, net	(36,878)	(33,726)
Proxy solicitation fees	(6,367)	0
Gain (loss) on debt redemption/refinancing	2,836	(4,993)
Gain on sale of businesses, including transaction costs	0	14,372
Gain (loss) on sale of business	0	878
Benefit (provision) for income taxes	3,250	(4,203)
Digital Commerce Solutions | Global Ecommerce
Segment Reporting Information [Line Items]
Adjusted EBIT	(34,206)	(13,696)
Digital Commerce Solutions | Presort Services
Segment Reporting Information [Line Items]
Adjusted EBIT	26,905	19,632
SendTech Solutions | Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBIT	$ 96,671	$ 104,575