Income Taxes - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Permanently reinvested earnings of non-U.S. subsidiaries	$ 28,600,000	$ 26,500,000
Unrecognized deferred income tax liabilities on currently permanently reinvested earnings	4,300,000	5,400,000
Foreign earnings repatriated	27,000,000.0	99,000,000.0	$ 135,000,000.0
Incremental income tax expense (benefit)	0	0	0
Accrued interest related to uncertain tax positions	0	200,000	100,000
Accrued penalties related to uncertain tax positions	0	0	0
Unrecognized tax benefits that would affect our effective tax rate	1,100,000	3,700,000	$ 4,100,000
Operating loss carryforwards and tax credit carryforwards	100,000	400,000
Net operating loss carryforwards for non-U.S.	7,400,000	16,500,000
Operating loss carryforwards, valuation allowance	600,000	600,000
Capital loss and other carryforwards	16,316,000	16,035,000
Foreign tax credit carryover for U.S. federal purposes	3,300,000	3,300,000
Federal
Income Tax Disclosure [Line Items]
Capital loss and other carryforwards	45,900,000	45,600,000
Capital loss carryforwards, valuation allowance	9,600,000	9,600,000
State and Local
Income Tax Disclosure [Line Items]
Net operating loss carryforwards	14,700,000	17,400,000
Capital loss and other carryforwards	45,900,000	62,100,000
Capital loss carryforwards, valuation allowance	900,000	800,000
Foreign
Income Tax Disclosure [Line Items]
Capital loss and other carryforwards	14,300,000	13,800,000
Other current assets
Income Tax Disclosure [Line Items]
Prepaid taxes	$ 20,900,000	$ 13,400,000