Segment Information (Net Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reconciliation of adjusted segment EBIT to income or loss from continuing operations before taxes:
Interest expense, net	$ (26,072)	$ (27,764)	$ (75,279)	$ (83,323)
Restructuring charges	(1,836)	(30,694)	(17,042)	(64,859)
Loss on debt redemption/refinancing	(82)	(2,142)	(24,446)	(2,142)
Asset impairment			0	(10,000)
Income (loss) from continuing operations before taxes	68,144	(43,880)	154,147	(4,130)
Presort Services
Segment Reporting Information [Line Items]
Adjusted EBIT	32,626	46,179	123,345	113,556
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBIT	133,685	148,159	422,686	407,473
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
Adjusted EBIT	101,059	101,980	299,341	293,917
Operating Segments | Presort Services
Segment Reporting Information [Line Items]
Adjusted EBIT	32,626	46,179	123,345	113,556
Reconciling Items
Segment Reporting Information [Line Items]
Adjusted EBIT	0	(7,312)	0	(12,142)
Reconciliation of adjusted segment EBIT to income or loss from continuing operations before taxes:
Interest expense, net	(37,287)	(43,859)	(112,671)	(131,986)
Corporate expenses	(26,350)	(38,062)	(93,369)	(124,557)
Restructuring charges	(1,836)	(30,694)	(17,042)	(64,859)
Loss on debt redemption/refinancing	(82)	(2,142)	(24,446)	(2,142)
Foreign currency gain (loss) on intercompany loans	3,390	(18,831)	(21,234)	(13,481)
Asset impairment	0	(10,000)	0	(10,000)
Transaction and Strategic review costs	(4,439)	(2,994)	(7,595)	(14,291)
Reconciling Items | Ecommerce | Discontinued Operations, Disposed of by Sale
Reconciliation of adjusted segment EBIT to income or loss from continuing operations before taxes:
Restructuring charges	$ 1,063	$ (38,145)	$ 7,818	$ (38,145)