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Fair Value Measurements (Narrative) (Details) $ in Thousands, € in Millions | 6 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 USD ($) | Jul. 02, 2023 USD ($) | Jun. 30, 2024 EUR (€) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 EUR (€) | Apr. 02, 2023 USD ($) | Mar. 13, 2023 USD ($) | Jan. 01, 2023 USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | $ 30,540 | $ 37,561 |  | $ 30,516 | $ 40,005 |  | $ 43,834 |  | $ 46,618
Unamortized Debt Issuance Expense | 19,872 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (4,180) |  |  |  |  |  |  |  |
Payment for Contingent Consideration Liability, Financing Activities | 8,749 | $ 10,117 |  |  |  |  |  |  |
Analytical, Food and Enterprise Services businesses [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Disposal Group, Consideration, Contingent on Exit Valuation |  |  |  |  |  |  |  | $ 150,000 |
2.55 Percent Senior Unsecured Notes due in 2031 [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | 2,455 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (93) |  |  |  |  |  |  |  |
3.625 Percent Senior Unsecured Notes due in 2051 [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | 4,091 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (3) |  |  |  |  |  |  |  |
1.875 Percent Ten Year Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | 1,029 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (1,121) |  |  |  |  |  |  |  |
3.3 Percent Ten Year Senior Unsecured Notes due in Sept 2029 [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Unamortized Debt Issuance Expense | 4,372 |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (1,580) |  |  |  |  |  |  |  |
Quoted Prices In Active Markets (Level 1) [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Carrying value of Investments in US Treasury Securities measured at amortized cost (held-to-maturity) | 706,100 |  |  |  | 689,900 |  |  |  |
Quoted Prices In Active Markets (Level 1) [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 0 |  |  |  | 0 |  |  |  |
Fair value of Investments in US Treasury Securities measured at amortized cost (held-to-maturity), classified as current | 704,500 |  |  |  | 688,700 |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt | 3,162,600 |  |  |  |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | 0 |  |  |  | 0 |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | 2.55 Percent Senior Unsecured Notes due in 2031 [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt | 397,452 |  |  |  |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | 3.625 Percent Senior Unsecured Notes due in 2051 [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt | 395,906 |  |  |  |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | 1.875 Percent Ten Year Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt | 533,550 |  |  |  |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | 3.3 Percent Ten Year Senior Unsecured Notes due in Sept 2029 [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt | 844,048 |  |  |  |  |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Senior Unsecured Notes [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Long-term Debt | 3,874,700 |  |  |  | 3,889,300 |  |  |  |
Unsecured senior notes, fair value | 3,469,700 |  |  |  | 3,474,500 |  |  |  |
Significant Other Observable Inputs (Level 2) [Member] | Other Debt Facilities, including the senior revolving credit facility [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Other Long-term Debt | € |  |  | € 0.9 |  |  | € 10.3 |  |  |
Significant Unobservable Inputs (Level 3) [Member] | Fair Value, Recurring [Member] |  |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value | $ 30,540 |  |  |  | $ 40,005 |  |  |  |

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