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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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