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Pensions - Summary of Pension Assets in Three-Tier Fair Value Hierarchy for Benefit Plan (Details) - USD ($)		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Receivables		$ 200,000	$ 300,000
U.S. Benefit Plan
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		118,800,000	131,700,000	$ 131,100,000
U.S. Benefit Plan | Total
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value	[1]	118,600,000	131,400,000
U.S. Benefit Plan | Total | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		4,800,000	4,200,000
U.S. Benefit Plan | Total | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		36,000,000	39,700,000
U.S. Benefit Plan | Total | US Small and Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		19,600,000	18,500,000
U.S. Benefit Plan | Total | Developed International Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		15,700,000	19,400,000
U.S. Benefit Plan | Total | Emerging Markets Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		10,900,000	12,900,000
U.S. Benefit Plan | Total | Government Securities Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		8,200,000	6,600,000
U.S. Benefit Plan | Total | Asset-backed Securities Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		12,500,000	11,700,000
U.S. Benefit Plan | Total | Corporate Bonds Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		10,600,000	13,900,000
U.S. Benefit Plan | Total | Mutual Funds Other Investments
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	1,400,000
U.S. Benefit Plan | Total | Real Estate
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		300,000	3,100,000
U.S. Benefit Plan | Level 1
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		87,900,000	97,900,000
U.S. Benefit Plan | Level 1 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		4,800,000	4,200,000
U.S. Benefit Plan | Level 1 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		36,000,000	39,700,000
U.S. Benefit Plan | Level 1 | US Small and Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		19,600,000	18,500,000
U.S. Benefit Plan | Level 1 | Developed International Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		8,900,000	12,300,000
U.S. Benefit Plan | Level 1 | Emerging Markets Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		10,100,000	12,100,000
U.S. Benefit Plan | Level 1 | Government Securities Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		8,200,000	6,600,000
U.S. Benefit Plan | Level 1 | Asset-backed Securities Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 1 | Corporate Bonds Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 1 | Mutual Funds Other Investments
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	1,400,000
U.S. Benefit Plan | Level 1 | Real Estate
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		300,000	3,100,000
U.S. Benefit Plan | Level 2
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		30,700,000	33,500,000
U.S. Benefit Plan | Level 2 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 2 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 2 | US Small and Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 2 | Developed International Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		6,800,000	7,100,000
U.S. Benefit Plan | Level 2 | Emerging Markets Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		800,000	800,000
U.S. Benefit Plan | Level 2 | Government Securities Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 2 | Asset-backed Securities Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		12,500,000	11,700,000
U.S. Benefit Plan | Level 2 | Corporate Bonds Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		10,600,000	13,900,000
U.S. Benefit Plan | Level 2 | Mutual Funds Other Investments
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 2 | Real Estate
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | US Large Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | US Small and Mid Cap Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | Developed International Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | Emerging Markets Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | Government Securities Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | Asset-backed Securities Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | Corporate Bonds Fixed Income | Fixed Income Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | Mutual Funds Other Investments
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
U.S. Benefit Plan | Level 3 | Real Estate
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		47,700,000	54,700,000	$ 48,500,000
Non-U.S. Benefit Plan | Total
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		47,700,000	54,700,000
Non-U.S. Benefit Plan | Total | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		100,000	800,000
Non-U.S. Benefit Plan | Total | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		36,400,000	41,100,000
Non-U.S. Benefit Plan | Total | Government Securities Fixed Income
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,800,000	3,600,000
Non-U.S. Benefit Plan | Total | Corporate Bonds Fixed Income
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		8,400,000	9,200,000
Non-U.S. Benefit Plan | Level 1
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		9,100,000	11,200,000
Non-U.S. Benefit Plan | Level 1 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		100,000	800,000
Non-U.S. Benefit Plan | Level 1 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 1 | Government Securities Fixed Income
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,800,000	3,600,000
Non-U.S. Benefit Plan | Level 1 | Corporate Bonds Fixed Income
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		6,200,000	6,800,000
Non-U.S. Benefit Plan | Level 2
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		38,600,000	43,500,000
Non-U.S. Benefit Plan | Level 2 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 2 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		36,400,000	41,100,000
Non-U.S. Benefit Plan | Level 2 | Government Securities Fixed Income
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 2 | Corporate Bonds Fixed Income
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		2,200,000	2,400,000
Non-U.S. Benefit Plan | Level 3
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Cash and Cash Equivalents
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Equity Securities
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Government Securities Fixed Income
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		0	0
Non-U.S. Benefit Plan | Level 3 | Corporate Bonds Fixed Income
Fair Value Hierarchy Of Plan Assets By Category [Line Items]
Total assets at fair value		$ 0	$ 0
[1] Total assets at fair value in the table above exclude a net receivable of $0.2 million and $0.3 million at December 31, 2018 and 2017, respectively.

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