Revenue from Contracts with Customers (Disaggregates of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	$ 750,385
Revenue from leasing transactions and financing	232,797
Total Consolidated Revenue	983,182	$ 836,640
Total revenue	750,385
Products/services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	167,375
Products/services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	583,010
Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	750,385
Revenue from leasing transactions and financing	0
Total Consolidated Revenue	750,385
Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	75,944
Revenue from leasing transactions and financing	79,864
Total Consolidated Revenue	155,808
Supplies
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	65,374
Revenue from leasing transactions and financing	0
Total Consolidated Revenue	65,374
Software
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	81,616
Revenue from leasing transactions and financing	0
Total Consolidated Revenue	81,616
Rentals
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	2,897
Revenue from leasing transactions and financing	92,383
Total Consolidated Revenue	95,280
Financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	19,553
Revenue from leasing transactions and financing	60,550
Total Consolidated Revenue	80,103
Support services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	118,462
Revenue from leasing transactions and financing	0
Total Consolidated Revenue	118,462
Business services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	386,539
Revenue from leasing transactions and financing	0
Total Consolidated Revenue	386,539
Leasing transactions and financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Revenue from leasing transactions and financing	232,797
Total Consolidated Revenue	232,797
Production Mail
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	96,257
Total Consolidated Revenue	97,191	88,955
Total revenue	97,191
Production Mail | Products/services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	50,817
Production Mail | Products/services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	45,440
Production Mail | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	96,257
Production Mail | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	45,435
Production Mail | Supplies
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	5,382
Production Mail | Software
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Production Mail | Rentals
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Production Mail | Financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Production Mail | Support services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	45,440
Production Mail | Business services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Production Mail | Leasing transactions and financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	934
Software Solutions
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	81,616
Total Consolidated Revenue	81,616	$ 78,220
Total revenue	81,616
Software Solutions | Products/services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	26,057
Software Solutions | Products/services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	55,559
Software Solutions | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	81,616
Software Solutions | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Software Solutions | Supplies
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Software Solutions | Software
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	81,616
Software Solutions | Rentals
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Software Solutions | Financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Software Solutions | Support services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Software Solutions | Business services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Software Solutions | Leasing transactions and financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Global Ecommerce
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	246,590
Total revenue	246,590
Global Ecommerce | Products/services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Global Ecommerce | Products/services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	246,590
Global Ecommerce | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	246,590
Global Ecommerce | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Global Ecommerce | Supplies
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Global Ecommerce | Software
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Global Ecommerce | Rentals
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Global Ecommerce | Financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Global Ecommerce | Support services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Global Ecommerce | Business services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	246,590
Global Ecommerce | Leasing transactions and financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Presort Services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	134,458
Total revenue	134,458
Presort Services | Products/services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Presort Services | Products/services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	134,458
Presort Services | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	134,458
Presort Services | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Presort Services | Supplies
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Presort Services | Software
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Presort Services | Rentals
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Presort Services | Financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Presort Services | Support services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
Presort Services | Business services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	134,458
Presort Services | Leasing transactions and financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
North America Mailing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	127,950
Total revenue	325,430
North America Mailing | Products/services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	56,096
North America Mailing | Products/services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	71,854
North America Mailing | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	127,950
North America Mailing | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	17,145
North America Mailing | Supplies
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	38,951
North America Mailing | Software
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
North America Mailing | Rentals
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	730
North America Mailing | Financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	16,577
North America Mailing | Support services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	50,744
North America Mailing | Business services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	3,803
North America Mailing | Leasing transactions and financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	197,480
International Mailing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	63,514
Total revenue	97,897
International Mailing | Products/services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	34,405
International Mailing | Products/services transferred over time
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	29,109
International Mailing | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	63,514
International Mailing | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	13,364
International Mailing | Supplies
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	21,041
International Mailing | Software
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	0
International Mailing | Rentals
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	2,167
International Mailing | Financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	2,976
International Mailing | Support services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	22,278
International Mailing | Business services
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	1,688
International Mailing | Leasing transactions and financing
Disaggregation of Revenue [Line Items]
Revenue from sales and services (ASC 606)	$ 34,383