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Acquisitions and Dispositions - Narrative (Details) shares in Thousands, $ in Thousands, € in Millions, £ in Millions |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended |  |
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Jul. 03, 2023 USD ($) | Apr. 25, 2023 USD ($) | Apr. 25, 2023 EUR (€) | Oct. 03, 2022 USD ($) | Jul. 15, 2022 USD ($) | Jul. 12, 2022 USD ($) | May 31, 2022 USD ($) | Apr. 19, 2022 USD ($) | Apr. 01, 2022 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) shares | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Oct. 03, 2022 GBP (£) | Jul. 12, 2022 GBP (£)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | $ 1,572,489 | $ 1,566,956 |  | $ 1,572,489 |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 617,573 |  | $ 663,791 | 1,872,282 | $ 1,979,607 |  |
Income attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  | 2,464 |  | 24,665 | (8,548) | 59,668 |  |
Net Income (Loss) Attributable to Parent |  |  |  |  |  |  |  |  |  | 653 |  | 10,609 | (3,597) | 33,747 |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 3,117 |  | 35,274 | (12,145) | 93,415 |  |
Hello Design |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  |  | $ 4,600 |  |  |  |  |  |  |
Closing cash payment |  |  |  |  |  |  |  |  | 3,600 |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
BNG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  | $ 20,900 |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  | $ 24,643 |  |  |  |  |  |  |  |
Estimated contingent consideration |  |  |  |  |  |  |  | $ 50,000 |  |  |  |  |  |  |  |
Contingent consideration payable in cash (percent) |  |  |  |  |  |  |  | 67.00% |  |  |  |  |  |  |  |
Contingent consideration payable in equity (percent) |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 7,700 |  | 5,900 | 21,800 | 11,200 |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (700) |  | (2,500) | (200) | (2,600) |  |
BNG | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
TMA Direct |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  |  |  |  | 87.00% |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  | $ 17,200 |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 6,569 |  |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired, Step One |  |  |  |  |  |  | 13.00% |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  |  |  |  |  | $ 13,300 |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 2,100 |  | 3,800 | 8,700 | 5,000 |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | 300 |  | $ 1,400 | 700 | $ 1,600 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | $ 13,200,000 | $ 12,740 |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired, Step One |  |  |  |  |  |  | 13.00% |  |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration Arrangements, Change in Range of Outcomes, Contingent Consideration, Liability, Value, High |  |  |  |  |  |  | $ 13,300 |  |  |  |  |  |  |  |  |
TMA Direct | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  |  |  |  | $ 1,800,000 | $ 6,150 |  |  |  |  |  |  |  |
Epicenter |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Closing cash payment |  |  |  | $ 9,900 |  |  |  |  |  |  |  |  |  |  |  |
Deferred acquisition consideration |  |  |  | $ 5,000 |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 4,416 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,100 |  |  | 3,300 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  | $ 11,864 |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (100) |  |  | 100 |  |  |
PEP Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  | $ 500 |  |  |  |  |  |  |  |  |  |
Estimated contingent consideration | £ |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 2.6
Apollo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  | $ 2,300 |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Business, First Payment |  |  |  |  | 1,000 |  |  |  |  |  |  |  |  |  |  |
Payments to Acquire Business, Second Payment |  |  |  |  | $ 1,500 |  |  |  |  |  |  |  |  |  |  |
Maru Group |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 8 years |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 26,033 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 7,700 |  |  | 25,500 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  | 25,794 |  |  |  |  |  |  |  |  |  |  | £ 23.0 |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | (3,200) |  |  | (7,600) |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 14,300 |  |  |  |  |  |  |  |  |  |  |  |
Maru Group | Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles |  |  |  | $ 4,900 |  |  |  |  |  |  |  |  |  |  |  |
Wolfgang |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining ownership interest acquired (percent) |  |  |  | 80.00% |  |  |  |  |  |  |  |  |  |  | 80.00% |
Closing cash payment |  |  |  | $ 3,800 |  |  |  |  |  |  |  |  |  |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | $ 2,451 |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  | 1,500 |  |  | 3,600 |  |  |
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net |  |  |  | 6,160 |  |  |  |  |  |  |  |  |  |  |  |
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest |  |  |  |  |  |  |  |  |  | $ 100 |  |  | $ 400 |  |  |
Wolfgang | Common Class A |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable |  |  |  | $ 1,200 |  |  |  |  |  |  |  |  |  |  |  |
Shares issued by the Company (shares) | shares |  |  |  |  |  |  |  |  |  |  | 175 |  |  |  |  |
Huskies [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 5,600 | € 5.2 |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | 2,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Combination, Payables to Sellers |  | $ 1,000 | € 0.9 |  |  |  |  |  |  |  |  |  |  |  |  |
Tinsel |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 2,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ 1,600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a)(3) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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