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Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |  |
Contingent acquisition liability, total change |  | $ (19.2) |
Long-term Debt, Fair Value |  | $ 2,757.6 | $ 2,552.3
Discount rate floor contingent acquisition obligations |  | 3.00% |
Discount rate ceiling contingent acquisition obligations |  | 6.00% |
Level 1 |  |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |  |
Cash equivalents |  | $ 581.3 | 1,688.1
Other Assets, Fair Value Disclosure |  | 2.8 | 1.1
Contingent acquisition obligations | [1] | 0.0 | 0.0
Long-term Debt, Fair Value |  | 0.0 | 0.0
Security Owned Not Readily Marketable, Fair Value |  | 99.0 | 0.0
Level 2 |  |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |  |
Cash equivalents |  | 0.0 | 0.0
Other Assets, Fair Value Disclosure |  | 0.0 | 0.0
Contingent acquisition obligations | [1] | 0.0 | 0.0
Long-term Debt, Fair Value |  | 2,757.2 | 2,551.5
Security Owned Not Readily Marketable, Fair Value |  | 0.0 | 0.0
Level 3 |  |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |  |
Cash equivalents |  | 0.0 | 0.0
Other Assets, Fair Value Disclosure |  | 0.0 | 0.0
Contingent acquisition obligations | [1] | 2.4 | 21.6
Long-term Debt, Fair Value |  | 0.4 | 0.8
Security Owned Not Readily Marketable, Fair Value |  | 0.0 | 0.0
Fair Value, Total [Member] |  |  |
Fair value assets and liabilities measured on recurring and nonrecurring basis |  |  |
Cash equivalents |  | 581.3 | 1,688.1
Other Assets, Fair Value Disclosure |  | 2.8 | 1.1
Contingent acquisition obligations | [1] | 2.4 | 21.6
Long-term Debt, Fair Value |  | 2,757.6 | 2,552.3
Security Owned Not Readily Marketable, Fair Value |  | $ 99.0 | $ 0.0
[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 decrease in this balance of $19.2 from December 31, 2022 to September 30, 2023 is primarily due to payments related to our deferred acquisitions payments from prior-year acquisitions and valuation adjustments, partially offset by new acquisitions and the exercises of redeemable non-controlling interest. 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 Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e7008-128479 + Details
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- Definition Amount of liability recognized arising from contingent consideration in a business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI https://asc.fasb.org/extlink&oid=126975305&loc=d3e6927-128479 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 35 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126966325&loc=d3e6819-128478 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 6 -URI https://asc.fasb.org/extlink&oid=6911189&loc=d3e6408-128476 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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- Definition Value of the not readily marketable security or category which has been determined by management based upon fair value methods, including pricing of similar securities and valuation techniques and is included in the schedule of financial condition or the balance sheet. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 820 -Section 50 -Paragraph 1 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=35710923&loc=d3e45360-110995 + Details
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