Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2019	Dec. 31, 2021
Segment reporting information profit (loss)
Revenue	$ 926,942	$ 915,197
Reconciliation of Segment EBIT to net income (loss):
Interest expense, net	(22,124)	(25,158)
Loss on debt redemption/refinancing	(4,993)	(51,394)
Gain on sale of business	2,522	0	$ 3,000
Gain on sale of assets	14,372	0
(Provision) benefit for income taxes	(4,203)	13,992
Income (loss) from continuing operations	20,821	(27,655)
Loss from discontinued operations, net of tax	0	(3,886)
Net income (loss)	20,821	(31,541)
Assets	4,787,064			$ 4,958,871
Operating Segments
Segment reporting information profit (loss)
EBIT	110,511	107,145
Segment Reconciling Items
Reconciliation of Segment EBIT to net income (loss):
Unallocated corporate expenses	(57,834)	(57,465)
Restructuring charges	(4,184)	(2,889)
Interest expense, net	(33,726)	(37,044)
Loss on debt redemption/refinancing	(4,993)	(51,394)
Gain on sale of business	2,522	0
Gain on sale of assets	14,372	0
Transaction costs	(1,644)	0
(Provision) benefit for income taxes	(4,203)	13,992
Global Ecommerce
Reconciliation of Segment EBIT to net income (loss):
Assets	3,000
Digital Commerce Solutions | Global Ecommerce
Segment reporting information profit (loss)
Revenue from contracts with customers	418,527	413,086
EBIT	(13,696)	(26,376)
Digital Commerce Solutions | Presort Services
Segment reporting information profit (loss)
Revenue from contracts with customers	160,544	143,126
EBIT	19,632	19,051
SendTech Solutions
Segment reporting information profit (loss)
Revenue from contracts with customers	347,871	358,985
SendTech Solutions | Operating Segments
Segment reporting information profit (loss)
EBIT	$ 104,575	$ 114,470