Segment Information (Net Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Reconciliation of adjusted segment EBIT to income or loss from continuing operations before taxes:
Interest expense, net	$ (24,937)	$ (28,253)	$ (49,207)	$ (55,559)
Restructuring charges	(13,806)	(30,399)	(15,206)	(34,165)
Gain (loss) on debt redemption/refinancing			(24,364)	0
Income (loss) from continuing operations before taxes	39,271	(7,854)	86,003	39,750
Presort Services
Segment Reporting Information [Line Items]
Adjusted EBIT	35,940	27,048	90,719	67,377
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBIT	137,195	123,071	289,001	259,314
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
Adjusted EBIT	101,255	96,023	198,282	191,937
Operating Segments | Presort Services
Segment Reporting Information [Line Items]
Adjusted EBIT	35,940	27,048	90,719	67,377
Reconciling Items
Segment Reporting Information [Line Items]
Adjusted EBIT	0	(4,121)	0	(4,831)
Reconciliation of adjusted segment EBIT to income or loss from continuing operations before taxes:
Interest expense, net	(37,499)	(44,218)	(75,384)	(88,127)
Corporate expenses	(34,902)	(44,293)	(67,019)	(86,495)
Restructuring charges	(13,806)	(30,399)	(15,206)	(34,165)
Gain (loss) on debt redemption/refinancing	282	0	(24,364)	0
Foreign currency (loss) gain on intercompany loans	(17,029)	712	(24,624)	5,350
Transaction and Strategic review costs	(1,266)	(8,606)	(3,156)	(11,296)
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	$ 6,296	$ 0	$ 6,755	$ 0