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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2020 | Apr. 29, 2020 | Dec. 31, 2019 | Jul. 23, 2018 | Jun. 13, 2016
--- | --- | --- | --- | --- | ---
Fair Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Long-term debt, fair value | $ 1,115.7 |  | $ 876.0 |  |
Carrying Value |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Long-term debt, fair value | $ 1,049.3 |  | $ 850.2 |  |
3.20% Senior Notes, due June 2023 | Senior Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Stated interest rate | 3.20% |  | 3.20% |  | 3.20%
3.37% Senior Notes, due June 2025 | Senior Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Stated interest rate | 3.37% |  | 3.37% |  | 3.37%
4.50% Senior Notes, due December 2020 | Senior Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Stated interest rate | 4.50% |  | 4.50% |  |
4.20% Senior Notes, due December 2021 | Senior Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Stated interest rate | 4.20% |  | 4.20% |  |
3.00% Senior Notes, due May 2030 | Senior Notes |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Stated interest rate | 3.00% | 3.00% |  |  |
Finger Lakes Instrumentation (FLI) |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |
Contingent consideration |  |  |  | $ 3.0 |

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