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Fair Value Measurements - Narrative (Details) - USD ($) | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Jul. 23, 2018 | Dec. 09, 2011 | Dec. 06, 2010
--- | --- | --- | --- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Transfers of assets between Level 1 and Level 2 | $ 0 |  | $ 0 |  |  |
Transfers of assets between Level 2 and Level 1 | 0 |  | 0 |  |  |
Transfers of liabilities between Level 1 and Level 2 | 0 |  | 0 |  |  |
Transfers of liabilities between Level 2 and Level 1 | 0 |  | 0 |  |  |
Contingent consideration |  |  | 3,375,000 |  |  |
FLI |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Contingent consideration |  | $ 3,000,000.0 |  | $ 3,400,000 |  |
Estimate of Fair Value Measurement |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Carrying value of our revolving facility and senior debt | 1,127,600,000 |  | 876,000,000.0 |  |  |
Reported Value Measurement |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Carrying value of our revolving facility and senior debt | $ 1,049,300,000 |  | $ 850,200,000 |  |  |
3.00% Senior Notes, due May 2030 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Stated interest rate | 3.00% |  |  |  |  |
3.20% Senior Notes, due June 2023 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Stated interest rate | 3.20% |  | 3.20% |  |  |
3.37% Senior Notes, due June 2025 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Stated interest rate | 3.37% |  | 3.37% |  |  |
4.50% Senior Notes, due December 2020 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Stated interest rate |  |  | 4.50% |  |  | 4.50%
4.20% Senior Notes, due December 2021 |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |
Stated interest rate | 4.20% |  | 4.20% |  | 4.20% |

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