Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment reporting information profit (loss)
Revenue	$ 860,779	$ 865,240	$ 1,729,181	$ 1,761,823
Reconciliation of Segment EBIT to net income:
Restructuring charges and asset impairments, net	(7,279)	(11,503)	(10,877)	(12,407)
Interest, net	(28,019)	(30,775)	(55,621)	(62,789)
Other income (expense)	27	0	(17,683)	0
Provision for income taxes	(4,099)	(7,899)	(12,400)	(26,694)
Income from continuing operations	30,278	50,387	28,849	101,870
(Loss) income from discontinued operations, net of tax	(6,581)	1,208	(7,811)	9,695
Net income	23,697	51,595	21,038	111,565
Operating Segments
Segment reporting information profit (loss)
EBIT	126,626	158,235	251,187	324,632
Segment Reconciling Items
Reconciliation of Segment EBIT to net income:
Unallocated corporate expenses	(43,785)	(46,477)	(99,474)	(97,559)
Restructuring charges and asset impairments, net	(7,279)	(11,503)	(10,877)	(12,407)
Interest, net	(39,062)	(41,969)	(78,028)	(85,047)
Other income (expense)	27	0	(17,683)	0
Transaction costs	(2,150)	0	(3,876)	(1,055)
Commerce Services
Segment reporting information profit (loss)
Revenue from contracts with customers	410,457	361,830	811,558	742,878
Commerce Services \| Operating Segments
Segment reporting information profit (loss)
EBIT	(114)	6,572	352	25,887
Commerce Services \| Global Ecommerce
Segment reporting information profit (loss)
Revenue from contracts with customers	282,319	239,100	548,573	485,690
EBIT	(15,576)	(5,993)	(30,176)	(13,704)
Commerce Services \| Presort Services
Segment reporting information profit (loss)
Revenue from contracts with customers	128,138	122,730	262,985	257,188
EBIT	15,462	12,565	30,528	39,591
SMB Solutions
Segment reporting information profit (loss)
Revenue from contracts with customers	378,116	411,707	772,099	850,948
SMB Solutions \| Operating Segments
Segment reporting information profit (loss)
EBIT	124,738	133,230	247,141	277,820
SMB Solutions \| North America Mailing
Segment reporting information profit (loss)
Revenue from contracts with customers	303,417	318,901	618,891	659,712
EBIT	112,804	120,139	223,417	248,707
SMB Solutions \| International Mailing
Segment reporting information profit (loss)
Revenue from contracts with customers	74,699	92,806	153,208	191,236
EBIT	11,934	13,091	23,724	29,113
Software Solutions
Segment reporting information profit (loss)
Revenue from contracts with customers	72,206	91,703	145,524	167,997
Software Solutions \| Operating Segments
Segment reporting information profit (loss)
EBIT	$ 2,002	$ 18,433	$ 3,694	$ 20,925

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