Segment Information (EBIT) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciling items:
Goodwill impairment	$ 0								$ 0	$ (198,169,000)	$ 0
Loss on debt refinancing									56,209,000	36,987,000	6,623,000
Gain (loss) on sale of assets/businesses									11,635,000	21,969,000	(17,683,000)
Benefit (provision) for income taxes	320,000	$ 1,525,000	$ (4,915,000)	$ 13,992,000	$ 350,000	$ (541,000)	$ (16,957,000)	$ 10,026,000	10,922,000	(7,122,000)	13,127,000
Income (loss) from continuing operations									3,507,000	(190,491,000)	39,859,000
(Loss) income from discontinued operations, net of tax	(524,000)	572,000	(1,020,000)	(3,886,000)	2,467,000	616,000	(3,032,000)	10,064,000	(4,858,000)	10,115,000	154,460,000
Net (loss) income	$ 1,267,000	$ 9,067,000	$ 19,856,000	$ (31,541,000)	$ 20,266,000	$ 11,351,000	$ (3,506,000)	$ (208,487,000)	(1,351,000)	(180,376,000)	194,319,000
Digital Commerce Solutions | Global Ecommerce
Segment Reporting Information [Line Items]
EBIT									(98,673,000)	(82,894,000)	(70,146,000)
Reconciling items:
Goodwill impairment										(198,169,000)
Digital Commerce Solutions | Presort Services
Segment Reporting Information [Line Items]
EBIT									79,721,000	55,799,000	70,693,000
Reconciling items:
Goodwill impairment										0
SendTech Solutions
Reconciling items:
Goodwill impairment										0
Operating Segments
Segment Reporting Information [Line Items]
EBIT									410,463,000	415,553,000	490,459,000
Operating Segments | SendTech Solutions
Segment Reporting Information [Line Items]
EBIT									429,415,000	442,648,000	489,912,000
Reconciling Items
Reconciling items:
Interest, net									(143,945,000)	(153,915,000)	(155,558,000)
Unallocated corporate expenses									(207,774,000)	(200,406,000)	(211,529,000)
Restructuring charges and asset impairments									(19,003,000)	(20,712,000)	(69,606,000)
Goodwill impairment									0	(198,169,000)	0
Loss on debt refinancing									(56,209,000)	(36,987,000)	(6,623,000)
Gain (loss) on sale of assets/businesses									11,635,000	11,908,000	(17,683,000)
Transaction costs									$ (2,582,000)	$ (641,000)	$ (2,728,000)