Segment Information (Net Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Reconciliation of adjusted segment EBIT to net income or loss:
Interest expense, net	$ (28,767)	$ (22,920)	$ (56,533)	$ (45,262)
Restructuring charges	(31,843)	(22,443)	(36,158)	(26,042)
Goodwill impairment	0	(118,599)	0	(118,599)
Gain on debt redemption			0	3,064
Benefit for income taxes	13,797	9,415	1,238	12,665
Net loss	(24,867)	(141,535)	(27,752)	(149,272)
Operating Segments
Segment Reporting Information [Line Items]
Adjusted EBIT	97,080	79,794	203,260	169,164
Segment Reconciling Items
Reconciliation of adjusted segment EBIT to net income or loss:
Interest expense, net	(44,732)	(37,683)	(89,101)	(74,561)
Unallocated corporate expenses	(51,275)	(47,709)	(101,045)	(104,058)
Restructuring charges	(31,843)	(22,443)	(36,158)	(26,042)
Goodwill impairment	0	(118,599)	0	(118,599)
Proxy solicitation fees	0	(4,538)	0	(10,905)
Gain on debt redemption	0	228	0	3,064
Foreign currency gain on intercompany loans	712	0	5,350	0
CEO and Board transition costs	(2,631)	0	(2,631)	0
Strategic review costs	(5,975)	0	(8,665)	0
Benefit for income taxes	13,797	9,415	1,238	12,665
SendTech Solutions
Segment Reporting Information [Line Items]
Adjusted EBIT	100,967	96,848	202,245	192,485
Presort Services
Segment Reporting Information [Line Items]
Adjusted EBIT	27,048	20,429	67,377	47,334
Global Ecommerce
Segment Reporting Information [Line Items]
Adjusted EBIT	$ (30,935)	$ (37,483)	$ (66,362)	$ (70,655)