Income Taxes - Narrative (Details) - USD ($)	3 Months Ended				12 Months Ended			24 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Income Tax Disclosure [Line Items]
Permanently reinvested earnings of non-U.S. subsidiaries	$ 18,200,000				$ 26,500,000	$ 18,200,000		$ 18,200,000
Unrecognized deferred income tax liabilities on currently permanently reinvested earnings	3,700,000				5,400,000	3,700,000		3,700,000
Foreign earnings repatriated					99,000,000.0	135,000,000.0	$ 3,300,000
Incremental income tax expense (benefit)						0	(6,400,000)
Tax Cuts and Jobs Act of 2017, one time transition tax for accumulated foreign earnings, income tax expense	(3,900,000)			$ 100,000			30,300,000
Transition Tax, obligation	26,500,000				20,600,000	26,500,000		26,500,000
Tax and Jobs Act of 2017, decrease in deferred tax liability	1,100,000						40,600,000	41,700,000
Tax Cuts and Jobs Act of 2017, provisional increase in its deferred tax liability							9,200,000
Tax Cuts and Jobs Act of 2017, adjustment to deferred income tax expense							$ 9,200,000
Tax Cuts and Jobs Act of 2017, permanent reinvestment, deferred tax liability		$ 0				9,100,000
Tax Cuts and Jobs Act of 2017, global intangible low taxed income, benchmark of the aggregate of the U.S. shareholder’s pro rata share of the qualified business asset							10.00%
Accrued interest related to uncertain tax positions	100,000				200,000	100,000	$ 100,000	100,000
Accrued penalties related to uncertain tax positions	0				0	0	0	0
Unrecognized tax benefits that would affect our effective tax rate	3,000,000.0				3,000,000.0	3,000,000.0	$ 900,000	3,000,000.0
Loss carry forwards for U.S. federal	1,300,000				400,000	1,300,000		1,300,000
Loss carry forwards for non-U.S.	29,500,000				16,500,000	29,500,000		29,500,000
Operating loss and credit carry forwards	15,800,000				17,400,000	15,800,000		15,800,000
Operating loss carryforwards, valuation allowance	600,000				600,000	600,000		600,000
Capital loss and other carryforwards	12,754,000				16,035,000	12,754,000		12,754,000
Foreign tax credit carryover for U.S. federal purposes	6,600,000				3,300,000	6,600,000		6,600,000
Federal
Income Tax Disclosure [Line Items]
Capital loss and other carryforwards	46,100,000				45,600,000	46,100,000		46,100,000
Capital loss carryforwards, valuation allowance	9,700,000				9,600,000	9,700,000		9,700,000
State and Local
Income Tax Disclosure [Line Items]
Capital loss and other carryforwards	62,700,000				62,100,000	62,700,000		62,700,000
Capital loss carryforwards, valuation allowance	800,000				800,000	800,000		800,000
Foreign
Income Tax Disclosure [Line Items]
Capital loss and other carryforwards	13,400,000				13,800,000	13,400,000		13,400,000
Minimum
Income Tax Disclosure [Line Items]
Tax Cuts and Jobs Act of 2017, permanent reinvestment, deferred tax liability			$ 1,400,000
Unrecognized tax benefits possible change					0
Maximum
Income Tax Disclosure [Line Items]
Tax Cuts and Jobs Act of 2017, permanent reinvestment, deferred tax liability			$ 7,800,000
Unrecognized tax benefits possible change					900,000
Other current assets
Income Tax Disclosure [Line Items]
Prepaid taxes	$ 8,300,000				$ 13,400,000	$ 8,300,000		$ 8,300,000