Consolidated Statements of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue:
Total revenue		$ 3,205,125	$ 3,211,522	$ 2,784,007
Costs and expenses:
Selling, general and administrative		1,003,989	1,002,935	1,029,494
Research and development		51,258	58,523	60,857
Restructuring charges and asset impairments, net		69,606	25,899	44,849
Interest expense, net		110,910	115,381	117,984
Other components of net pension and postretirement cost		(4,225)	22,425	5,413
Other expense		24,306	7,964	3,856
Total costs and expenses		3,177,983	3,023,401	2,590,309
Total		27,142	188,121	193,698
(Benefit) provision for income taxes		(13,007)	6,416	13,659
Income from continuing operations		40,149	181,705	180,039
Income from discontinued operations, net of tax		154,460	60,106	63,489
Net income		$ 194,609	$ 241,811	$ 243,528
Basic earnings per share attributable to common stockholders:
Continuing operations (in dollars per share)	[1]	$ 0.23	$ 0.97	$ 0.97
Discontinued operations (in dollars per share)	[1]	0.88	0.32	0.34
Net income (in dollars per share)	[1]	1.10	1.29	1.31
Diluted earnings per share attributable to common stockholders:
Continuing operations (in dollars per share)	[1]	0.23	0.96	0.96
Discontinued operations (in dollars per share)	[1]	0.87	0.32	0.34
Net income (in dollars per share)	[1]	$ 1.10	$ 1.28	$ 1.30
Business services
Revenue:
Total from contracts with customers		$ 1,710,801	$ 1,566,470	$ 1,071,021
Total revenue		1,710,801	1,566,470	1,071,021
Costs and expenses:
Cost of products and sales		1,389,569	1,233,105	770,018
Support services
Revenue:
Total from contracts with customers		506,187	552,472	581,474
Total revenue		506,187	552,472	581,474
Costs and expenses:
Cost of products and sales		162,300	178,495	173,555
Financing
Revenue:
Total from contracts with customers		0	0	0
Total revenue		368,090	394,557	406,395
Costs and expenses:
Cost of products and sales		44,648	44,376	46,178
Equipment sales
Revenue:
Total from contracts with customers		80,562	88,616	119,416
Total revenue		352,104	395,652	400,704
Costs and expenses:
Cost of equipment sales		244,210	236,160	238,062
Supplies
Revenue:
Total from contracts with customers		187,287	218,304	231,412
Total revenue		187,287	218,304	231,412
Costs and expenses:
Cost of products and sales		49,882	60,960	66,302
Financing
Revenue:
Total from contracts with customers		0	0	0
Total revenue		80,656	84,067	93,001
Costs and expenses:
Cost of products and sales		$ 31,530	$ 37,178	$ 33,741

[1] The sum of the earnings per share amounts may not equal the totals due to rounding.