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Fair Value Measurements (Tables) | 9 Months Ended
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Sep. 30, 2024
Fair Value Disclosures [Abstract] |  |
Fair Value, Assets and Liabilities Measured on Recurring Basis | The following tables present information about our financial instruments measured at fair value on a recurring basis as of September 30, 2024 and December 31, 2023, and indicate the fair value hierarchy of the valuation techniques utilized to determine such fair value.
| September 30, 2024 |  | Balance Sheet Classification
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 472.6 |  |  | $ | — |  |  | $ | — |  |  | $ | 472.6 |  |  | Cash and cash equivalents
Liabilities |  |  |  |  |  |  |  |  |
Contingent acquisition obligations 1 | $ | — |  |  | $ | — |  |  | $ | 5.0 |  |  | $ | 5.0 |  |  | Accrued liabilities and Other non-current liabilities
| December 31, 2023 |  | Balance Sheet Classification
| Level 1 |  | Level 2 |  | Level 3 |  | Total |
Assets |  |  |  |  |  |  |  |  |
Cash equivalents | $ | 1,521.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 1,521.5 |  |  | Cash and cash equivalents
Liabilities |  |  |  |  |  |  |  |  |
Contingent acquisition obligations 1 | $ | — |  |  | $ | — |  |  | $ | 3.1 |  |  | $ | 3.1 |  |  | Accrued liabilities and Other non-current liabilities
1 Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional non-controlling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The increase in this balance of $1.9 from December 31, 2023 to September 30, 2024 is primarily due to the exercises of redeemable non-controlling interest, partially offset by payments related to our deferred acquisitions from prior-year acquisitions. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities. | [1]
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis | The following table presents information about our financial instruments that are not measured at fair value on a recurring basis as of September 30, 2024 and December 31, 2023, and indicates the fair value hierarchy of the valuation techniques utilized to determine such fair value.
| September 30, 2024 |  | December 31, 2023
| Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Total long-term debt | $ | — |  |  | $ | 2,792.0 |  |  | $ | 0.4 |  |  | $ | 2,792.4 |  |  | $ | — |  |  | $ | 2,974.5 |  |  | $ | 0.8 |  |  | $ | 2,975.3 |
[1] | Contingent acquisition obligations includes deferred acquisition payments and unconditional obligations to purchase additional non-controlling equity shares of consolidated subsidiaries. Fair value measurement of the obligations is based upon actual and projected operating performance targets as specified in the related agreements. The increase in this balance of $1.9 from December 31, 2023 to September 30, 2024 is primarily due to the exercises of redeemable non-controlling interest, partially offset by payments related to our deferred acquisitions from prior-year acquisitions. The amounts payable within the next twelve months are classified in accrued liabilities; any amounts payable thereafter are classified in other non-current liabilities.

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- Definition Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 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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- 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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