Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Employee benefits other than pension	$ 21,903	$ 23,272
Lease liabilities	22,108	9,415
Deferred revenue	33,824	30,715
Pension obligations	27,865	27,407
Tax loss carryforwards	259,035	59,939
Incentive consideration	4,158	6,722
Tax credit carryforwards	47,110	18,496
Suspended loss	14,528	14,635
Accrued expenses	1,797	7,547
Other	0	533
Total deferred tax assets	432,328	198,681
Deferred tax liabilities:
Exchangeable notes	(19,114)	0
Right of use assets	(21,376)	(9,261)
Depreciation and amortization	(8,284)	(7,059)
Software developed for internal use	(19,917)	(66,918)
Intangible assets	(110,625)	(120,528)
Unrealized gains and losses	(24,109)	(18,778)
Non U.S. operations	(15,674)	(16,149)
Investment in partnership	(7,565)	(7,306)
Other	(2,974)	0
Total deferred tax liabilities	(229,638)	(245,999)
Valuation allowance	(251,253)	(38,272)
Net deferred tax (liability)	$ (48,563)	$ (85,590)

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