Revenue (Disaggregates of Revenue) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenue from leasing transactions and financing									$ 3,205,125	$ 3,211,522	$ 2,784,007
Revenue	$ 831,343	$ 790,125	$ 788,573	$ 795,084	$ 857,414	$ 760,281	$ 773,538	$ 820,289	3,205,125	3,211,522	2,784,007
ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									2,484,837	2,425,862	2,003,323
Products/services transferred at a point in time | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									334,046	386,844	421,470
Products/services transferred over time | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									2,150,791	2,039,018	1,581,853
Business services
Disaggregation of Revenue [Line Items]
Revenue from products and services									1,710,801	1,566,470	1,071,021
Revenue from leasing transactions and financing									0	0	0
Revenue									1,710,801	1,566,470	1,071,021
Support services
Disaggregation of Revenue [Line Items]
Revenue from products and services									506,187	552,472	581,474
Revenue from leasing transactions and financing									0	0	0
Revenue									506,187	552,472	581,474
Financing
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									368,090	394,557	406,395
Revenue									368,090	394,557	406,395
Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from products and services									80,562	88,616	119,416
Revenue from leasing transactions and financing									271,542	307,036	281,288
Revenue									352,104	395,652	400,704
Supplies
Disaggregation of Revenue [Line Items]
Revenue from products and services									187,287	218,304	231,412
Revenue from leasing transactions and financing									0	0	0
Revenue									187,287	218,304	231,412
Rentals
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									80,656	84,067	93,001
Revenue									80,656	84,067	93,001
Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from products and services									2,484,837	2,425,862	2,003,323
Revenue from leasing transactions and financing									720,288	785,660	780,684
Revenue									3,205,125	3,211,522	2,784,007
Global Ecommerce
Disaggregation of Revenue [Line Items]
Revenue from leasing transactions and financing									1,151,510	1,022,862	552,242
Global Ecommerce | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									1,151,510	1,022,862	552,242
Global Ecommerce | Products/services transferred at a point in time | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Global Ecommerce | Products/services transferred over time | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									1,151,510	1,022,862	552,242
Global Ecommerce | Business services
Disaggregation of Revenue [Line Items]
Revenue from products and services									1,151,510	1,022,862	551,678
Global Ecommerce | Support services
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	564
Global Ecommerce | Financing
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									0	0	0
Global Ecommerce | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									0	0	0
Global Ecommerce | Supplies
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Global Ecommerce | Rentals
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									0	0	0
Global Ecommerce | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from products and services									1,151,510	1,022,862	552,242
Presort Services
Disaggregation of Revenue [Line Items]
Revenue from leasing transactions and financing									529,588	515,795	497,901
Presort Services | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									529,588	515,795	497,901
Presort Services | Products/services transferred at a point in time | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Presort Services | Products/services transferred over time | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									529,588	515,795	497,901
Presort Services | Business services
Disaggregation of Revenue [Line Items]
Revenue from products and services									529,588	515,795	497,901
Presort Services | Support services
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Presort Services | Financing
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									0	0	0
Presort Services | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									0	0	0
Presort Services | Supplies
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Presort Services | Rentals
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									0	0	0
Presort Services | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from products and services									529,588	515,795	497,901
SendTech Solutions
Disaggregation of Revenue [Line Items]
Revenue from leasing transactions and financing									1,524,027	1,672,865	1,733,864
SendTech Solutions | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									803,739	887,205	953,180
SendTech Solutions | Products/services transferred at a point in time | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									334,046	386,844	421,470
SendTech Solutions | Products/services transferred over time | ASC 606
Disaggregation of Revenue [Line Items]
Revenue from products and services									469,693	500,361	531,710
SendTech Solutions | Business services
Disaggregation of Revenue [Line Items]
Revenue from products and services									29,703	27,813	21,442
SendTech Solutions | Support services
Disaggregation of Revenue [Line Items]
Revenue from products and services									506,187	552,472	580,910
SendTech Solutions | Financing
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									368,090	394,557	406,395
SendTech Solutions | Equipment sales
Disaggregation of Revenue [Line Items]
Revenue from products and services									80,562	88,616	119,416
Revenue from leasing transactions and financing									271,542	307,036	281,288
SendTech Solutions | Supplies
Disaggregation of Revenue [Line Items]
Revenue from products and services									187,287	218,304	231,412
SendTech Solutions | Rentals
Disaggregation of Revenue [Line Items]
Revenue from products and services									0	0	0
Revenue from leasing transactions and financing									80,656	84,067	93,001
SendTech Solutions | Sales And Services
Disaggregation of Revenue [Line Items]
Revenue from products and services									$ 803,739	$ 887,205	$ 953,180