Finance Receivables, net Finance Receivables, net (Allowance for Expected Recoveries) (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 01, 2020	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 3,514,165	$ 3,351,532		$ 3,514,165
Initial negative allowance for expected recoveries - acquisitions		177,600		615,336
Foreign currency translation adjustment		60,686		(45,085)
Expected recoveries	(3,514,165)	(282,473)		(784,056)
Changes in estimated recoveries		25,403	$ 0	32,388	$ 0
Balance at end of period	3,514,165	3,332,748		3,332,748
Core
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	3,051,426	2,908,136		3,051,426
Initial negative allowance for expected recoveries - acquisitions		159,069		537,477
Foreign currency translation adjustment		53,934		(42,065)
Expected recoveries		(246,738)		(677,211)
Changes in estimated recoveries		23,744		28,518
Balance at end of period		2,898,145		2,898,145
Insolvency
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Balance at beginning of period	$ 462,739	443,396		462,739
Initial negative allowance for expected recoveries - acquisitions		18,531		77,859
Foreign currency translation adjustment		6,752		(3,020)
Expected recoveries		(35,735)		(106,845)
Changes in estimated recoveries		1,659		3,870
Balance at end of period		$ 434,603		$ 434,603