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Fair Value (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value [Abstract] |
Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis | Financial assets and liabilities measured at fair value on a recurring basis:
September 30, 2025 | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 3,406.5 |  |  |  |  |  |  | $ | 3,406.5 |
Marketable equity securities | $ | 0.9 |  |  |  |  |  |  | $ | 0.9 |
Liabilities: |  |  |  |  |  |  |
Cross currency swaps - net investment hedge |  |  | $ | 8.8 |  |  |  |  | $ | 8.8 |
Contingent purchase price obligations |  |  |  |  | $ | 204.8 |  |  | $ | 204.8 |
December 31, 2024 |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Assets: |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 4,339.4 |  |  |  |  |  |  | $ | 4,339.4 |
Marketable equity securities |  | 0.9 |  |  |  |  |  |  | 0.9 |
Cross currency swaps - net investment hedge |  |  |  | $ | 9.3 |  |  |  |  | 9.3 |
Liabilities: |  |  |  |  |  |  |  |
Foreign currency derivatives |  |  |  | $ | 0.1 |  |  |  |  | $ | 0.1 |
Contingent purchase price obligations |  |  |  |  |  | $ | 220.1 |  |  | 220.1 |
Changes in Contingent Purchase Price Obligations | Changes in contingent purchase price obligations:
| Nine Months Ended September 30,
| 2025 |  | 2024
January 1 | $ | 220.1 |  |  | $ | 229.5 |
Acquisitions | 27.6 |  |  | 28.5 |
Revaluation and interest | 4.5 |  |  | 1.9 |
Payments | (47.9) |  |  | (23.6) |
Foreign currency translation | 0.5 |  |  | 0.1 |
September 30 | $ | 204.8 |  |  | $ | 236.4 |
Carrying Amount and Fair Value of Financial Assets and Liabilities | Carrying amount and fair value of our financial assets and liabilities:
| September 30, 2025 |  | December 31, 2024
| Carrying Amount |  | Fair Value |  | Carrying Amount |  | Fair Value
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | $ | 3,406.5 |  |  | $ | 3,406.5 |  |  | $ | 4,339.4 |  |  | $ | 4,339.4 |
Marketable equity securities | 0.9 |  |  | 0.9 |  |  | 0.9 |  |  | 0.9 |
Non-marketable equity securities | 30.6 |  |  | 30.6 |  |  | 36.8 |  |  | 36.8 |
Cross currency swaps - net investment hedge | — |  |  | — |  |  | 9.3 |  |  | 9.3 |
Liabilities: |  |  |  |  |  |  |
Short-term debt | $ | 24.1 |  |  | $ | 24.1 |  |  | $ | 21.3 |  |  | $ | 21.3 |
Foreign currency derivatives | — |  |  | — |  |  | 0.1 |  |  | 0.1 |
Cross currency swaps - net investment hedge | 8.8 |  |  | 8.8 |  |  | — |  |  | — |
Contingent purchase price obligations | 204.8 |  |  | 204.8 |  |  | 220.1 |  |  | 220.1 |
Long-Term Debt | 6,275.2 |  |  | 6,036.3 |  |  | 6,035.3 |  |  | 5,664.9 |

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- Definition Tabular disclosure of the fair value of financial instruments, including financial assets and financial liabilities, and the measurements of those instruments, assets, and liabilities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name Accounting Standards Codification -Section 55 -Paragraph 10 -SubTopic 10 -Topic 825 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-10 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-13 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482881/825-10-55-12 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-12 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482907/825-10-50-11 + Details
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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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