Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net (loss) income	$ (208,483)	$ (181,544)	$ 194,609	$ 241,811
Income from discontinued operations, net of tax	(10,064)	(10,115)	(154,460)	(60,106)
Restructuring payments		(20,014)	(27,148)	(52,730)
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and amortization		160,625	159,142	148,464
Allowance for credit losses		42,193	28,488	26,370
Stock-based compensation		17,476	23,149	21,042
Restructuring charges and asset impairments		20,712	69,606	25,899
Amortization of debt fees		10,871	10,482	6,771
Goodwill impairment		198,169	0	0
Loss on extinguishment of debt		36,987	6,623	7,964
Gain on sale of investments		(21,969)	0	0
Loss on sale of businesses		0	17,683	0
Pension plan settlement		0	0	31,329
Deferred tax provision		14,885	4,931	64,065
Changes in operating assets and liabilities, net of acquisitions/divestitures:
Increase in accounts and other receivables		(47,236)	(8,027)	(53,801)
Decrease in finance receivables	17,772	70,505	29,171	38,453
Decrease (increase) in inventories		3,145	(5,588)	(1,441)
Increase in other current assets and prepayments		(19,581)	(27,096)	(9,881)
Increase (decrease) in accounts payable and accrued liabilities		94,851	22,081	(4,368)
Increase (decrease) in current and noncurrent income taxes		8,622	(40,119)	(28,127)
Increase (decrease) in advance billings		11,009	(10,361)	(19,802)
Decrease in pension and retiree medical liabilities		(36,009)	(37,469)	(40,941)
Other, net		(13,698)	2,914	11,597
Net cash provided by operating activities: continuing operations	(29,550)	339,884	258,611	352,568
Net cash (used in) provided by operating activities: discontinued operations		(37,912)	9,272	(7,916)
Net cash provided by operating activities	(67,355)	301,972	267,883	344,652
Cash flows from investing activities:
Capital expenditures		(104,987)	(137,253)	(137,810)
Purchases of investment securities	(107,312)	(596,841)	(137,194)	(82,153)
Proceeds from sales/maturities of investment securities	104,222	576,536	108,548	175,866
Net investment in loan receivables		(4,174)	(15,676)	(1,773)
Acquisitions, net of cash acquired		(6,608)	(22,100)	(10,484)
Sale of other investments		58,248	0	0
Other investing activities	8,081	4,636	(8,905)	8,168
Net cash used in investing activities: continuing operations	(20,997)	(73,190)	(212,580)	(48,186)
Net cash (used in) provided by investing activities: discontinued operations		(2,502)	670,130	334,532
Net cash (used in) provided by investing activities	(23,499)	(75,692)	457,550	286,346
Cash flows from financing activities:
Proceeds from issuance of long-term debt		916,544	389,986	0
Principal payments of long-term debt		(1,105,650)	(930,189)	(570,180)
Premiums and fees to extinguish debt		(32,645)	(4,704)	(6,575)
Dividends paid to stockholders		(34,291)	(35,361)	(140,498)
Common stock repurchases		0	(105,000)	0
Increase in customer deposits at the Bank	(888)	26,082	16,341	21,008
Other financing activities		(5,411)	(1,372)	(49,166)
Net cash used in financing activities	(160,484)	(235,371)	(670,299)	(745,411)
Effect of exchange rate changes on cash and cash equivalents		6,099	2,046	(25,381)
(Decrease) increase in cash and cash equivalents		(2,992)	57,180	(139,794)
Cash and cash equivalents at beginning of period	$ 924,442	924,442	867,262	1,009,021
Cash and cash equivalents at end of period		921,450	924,442	869,227
Less cash and cash equivalents of discontinued operations		0	0	1,965
Cash and cash equivalents of continuing operations at end of period		921,450	924,442	867,262
Cash interest paid		151,857	157,709	171,120
Cash income tax payments, net of refunds		$ 20,185	$ 27,109	$ 25,906