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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
Valuation And Qualifying Accounts [Abstract] |
Schedule II - Valuation and Qualifying Accounts | MKS Instruments, Inc. SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
|  |  |  |  |  | Additions |  |  |  |  |  |  |  |  |
Description |  | Balance at Beginning of Year |  |  | Acquisition Beginning Balance |  |  | Charged to Costs and Expenses |  |  | Charged to Other Accounts |  |  | Deductions & Write-offs |  |  | Balance at End of Year |
Allowance for doubtful accounts: |  |  |  |  |  | (in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Years ended December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 |  | $ | 1.8 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 2.0 |
2019 |  | $ | 5.2 |  |  | $ | 0.2 |  |  | $ | (0.7 | ) |  | $ | — |  |  | $ | (2.9 | ) |  | $ | 1.8 |
2018 |  | $ | 4.1 |  |  | $ | — |  |  | $ | 1.4 |  |  | $ | — |  |  | $ | (0.3 | ) |  | $ | 5.2 |
|  |  |  |  |  | Additions |  |  |  |  |  |  |  |  |
Description |  | Balance at Beginning of Year |  |  | Acquisition Beginning Balance |  |  | Charged to Costs and Expenses |  |  | Charged to Other Accounts |  |  | Deductions & Write-offs |  |  | Balance at End of Year |
Allowance for sales returns: |  |  |  |  |  | (in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Years ended December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 |  | $ | 1.4 |  |  | $ | — |  |  | $ | 0.3 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | 1.8 |
2019 |  | $ | 1.0 |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | 1.4 |
2018 |  | $ | 1.3 |  |  | $ | — |  |  | $ | 0.1 |  |  | $ | — |  |  | $ | (0.4 | ) |  | $ | 1.0 |
|  |  |  |  |  | Additions |  |  |  |  |  |  |  |  |
Description |  | Balance at Beginning of Year |  |  | Acquisition Beginning Balance |  |  | Charged to Costs and Expenses |  |  | Charged to Other Accounts |  |  | Deductions |  |  | Balance at End of Year |
Valuation allowance on deferred tax asset: |  |  |  |  |  | (in millions) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Years ended December 31, |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2020 |  | $ | 27.4 |  |  | $ | — |  |  | $ | 4.2 |  |  | $ | — |  |  | $ | (1.0 | ) |  | $ | 30.6 |
2019 |  | $ | 17.9 |  |  | $ | 5.9 |  |  | $ | 4.9 |  |  | $ | — |  |  | $ | (1.3 | ) |  | $ | 27.4 |
2018 |  | $ | 13.6 |  |  | $ | — |  |  | $ | 4.8 |  |  | $ | — |  |  | $ | (0.5 | ) |  | $ | 17.9 |

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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