Income Taxes - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Mar. 31, 2020
Income Tax Contingency [Line Items]
Discrete benefit from net operating loss carryback from CARES Act					$ 125,000
Deferred payroll tax liability from CARES Act			$ 41,000
Deferred tax liabilities which have not been recorded with respect to unremitted earnings that are considered indefinitely reinvested			28,000
U.S. foreign tax credits	$ 226,845		414,348	$ 226,845
Charge to tax expense to record valuation allowance	(185,000)	$ (546,000)
Unrecognized tax benefits that, if recognized, would have favorably impacted effective tax rates	22,000		30,000	22,000
Accrued interest and penalties	$ 10,000		11,000	10,000
Domestic
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			159,000
Charge to tax expense to record valuation allowance			142,000	602,000
Foreign
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			1,200,000
Net operating loss carryforwards, with expiration			296,000
Net operating loss carryforwards, able to be carried forward indefinitely			800,000
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			908,000
Net operating loss carryforwards, with expiration			117,000
Netherlands and Belgium
Income Tax Contingency [Line Items]
Charge to tax expense to record valuation allowance				$ 129,000
Netherlands and Belgium | Foreign
Income Tax Contingency [Line Items]
Charge to tax expense to record valuation allowance			28,000
United Kingdom | Foreign
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			599,000
Netherlands | Foreign
Income Tax Contingency [Line Items]
Net operating loss carryforwards related to various jurisdictions			$ 345,000