Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment reporting information profit (loss)
Total revenue	$ 861,436	$ 730,413	$ 1,742,384	$ 1,473,593
Reconciling items:
Interest, net	(29,623)	(27,600)	(60,476)	(53,276)
Restructuring charges and asset impairments, net	(11,503)	(25,990)	(12,407)	(27,639)
Gain from the sale of technology			0	6,085
Income from continuing operations before taxes	53,464	42,251	114,753	126,757
Provision for income taxes	6,458	790	22,721	27,872
Income from discontinued operations, net of tax	1,208	7,440	9,695	15,149
Net income	48,214	48,901	101,727	114,034
Operating Segments
Segment reporting information profit (loss)
EBIT	153,413	155,148	310,821	337,555
Segment Reconciling Items
Reconciling items:
Unallocated corporate expenses	(46,477)	(52,549)	(97,561)	(110,151)
Interest, net	(41,969)	(40,443)	(85,047)	(79,093)
Restructuring charges and asset impairments, net	(11,503)	(25,990)	(12,407)	(27,639)
Gain from the sale of technology	0	6,085	0	6,085
Transaction costs	0	0	(1,053)	0
Commerce Services
Segment reporting information profit (loss)
Total revenue	361,830	212,958	742,878	433,787
Commerce Services \| Operating Segments
Segment reporting information profit (loss)
EBIT	6,572	15,240	25,887	41,687
Commerce Services \| Global Ecommerce
Segment reporting information profit (loss)
Total revenue	239,100	94,506	485,690	182,658
EBIT	(5,993)	(4,030)	(13,704)	(8,300)
Commerce Services \| Presort Services
Segment reporting information profit (loss)
Total revenue	122,730	118,452	257,188	251,129
EBIT	12,565	19,270	39,591	49,987
Small & Medium Business Solutions
Segment reporting information profit (loss)
Total revenue	407,904	436,374	831,510	885,526
Small & Medium Business Solutions \| Operating Segments
Segment reporting information profit (loss)
EBIT	128,408	134,817	264,009	289,471
Small & Medium Business Solutions \| North America Mailing
Segment reporting information profit (loss)
Total revenue	314,546	340,949	640,115	696,902
EBIT	115,193	120,797	234,763	262,041
Small & Medium Business Solutions \| International Mailing
Segment reporting information profit (loss)
Total revenue	93,358	95,425	191,395	188,624
EBIT	13,215	14,020	29,246	27,430
Software Solutions
Segment reporting information profit (loss)
Total revenue	91,702	81,081	167,996	154,280
Software Solutions \| Operating Segments
Segment reporting information profit (loss)
EBIT	$ 18,433	$ 5,091	$ 20,925	$ 6,397

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