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Business Acquisitions and Dispositions (Details) $ in Millions |  |  |  |  |  |  |  |  | 12 Months Ended
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Aug. 20, 2024 USD ($) | Feb. 26, 2024 USD ($) | Dec. 26, 2023 USD ($) | Aug. 21, 2023 USD ($) | Aug. 07, 2023 USD ($) | Aug. 04, 2023 USD ($) | May 02, 2023 USD ($) | Oct. 04, 2022 USD ($) | Dec. 31, 2024 USD ($) acquisition | Dec. 31, 2023 USD ($) acquisition | Dec. 31, 2022 USD ($) acquisition
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  |  |  |  |  |  | 4 | 4 | 7
Goodwill |  |  |  |  |  |  |  |  | $ 19,312.9 | $ 17,118.8 | $ 15,946.1
Cash paid, net of cash acquired |  |  |  |  |  |  |  |  | 3,612.9 | 2,052.7 | 4,280.1
Proceeds from sale of equity investment |  |  |  |  |  |  |  |  | $ 245.6 | $ 0.0 | $ 0.0
Certinia Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 18.20% |  |  |  |  |
Cash paid, net of cash acquired |  |  |  |  |  | $ 125.0 |  |  |  |  |
Genesis Ultimate Holding Co. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  | $ 1,860.0 |  |  |  |  |  |  |  |  |
Federal tax attributes |  | $ 110.0 |  |  |  |  |  |  |  |  |
Tax benefit utilization period (in years) |  | 13 years |  |  |  |  |  |  |  |  |
Goodwill |  | $ 1,208.2 |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  | 762.0 |  |  |  |  |  |  |  |  |
Deferred tax liabilities |  | 122.0 |  |  |  |  |  |  |  |  |
Genesis Ultimate Holding Co. | Trade names |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, not subject to amortization |  | 39.0 |  |  |  |  |  |  |  |  |
Genesis Ultimate Holding Co. | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  | $ 708.0 |  |  |  |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets (in years) |  | 20 years |  |  |  |  |  |  |  |  |
Genesis Ultimate Holding Co. | Technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  | $ 54.0 |  |  |  |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets (in years) |  | 5 years |  |  |  |  |  |  |  |  |
RCP Vega Holdings, LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price | $ 1,607.0 |  |  |  |  |  |  |  |  |  |
Federal tax attributes | $ 100.0 |  |  |  |  |  |  |  |  |  |
Tax benefit utilization period (in years) | 14 years |  |  |  |  |  |  |  |  |  |
Goodwill | $ 947.3 |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles | 705.0 |  |  |  |  |  |  |  |  |  |
Deferred tax liabilities | 76.0 |  |  |  |  |  |  |  |  |  |
RCP Vega Holdings, LLC | Trade names |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, not subject to amortization | 41.0 |  |  |  |  |  |  |  |  |  |
RCP Vega Holdings, LLC | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles | $ 656.0 |  |  |  |  |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets (in years) | 18 years |  |  |  |  |  |  |  |  |  |
RCP Vega Holdings, LLC | Technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles | $ 49.0 |  |  |  |  |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets (in years) | 6 years |  |  |  |  |  |  |  |  |  |
Other acquisitions |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of businesses acquired | acquisition |  |  |  |  |  |  |  |  | 2 | 3 | 6
Aggregate purchase price |  |  |  |  |  |  |  |  | $ 153.1 |  | $ 578.8
Goodwill |  |  |  |  |  |  |  |  | 99.9 | $ 330.6 | 361.5
Other identifiable intangibles |  |  |  |  |  |  |  |  | 53.3 | 229.1 | 239.3
Other acquisitions | Trade names |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, not subject to amortization |  |  |  |  |  |  |  |  | 3.2 | 15.4 | 9.5
Other acquisitions | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  |  |  |  |  | $ 47.3 | $ 209.4 | $ 223.4
Weighted average useful life of finite-lived intangible assets (in years) |  |  |  |  |  |  |  |  | 14 years 6 months | 16 years 10 months 24 days | 18 years 2 months 12 days
Other acquisitions | Technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  |  |  |  |  | $ 6.0 | $ 19.7 | $ 15.9
Weighted average useful life of finite-lived intangible assets (in years) |  |  |  |  |  |  |  |  | 5 years | 5 years | 4 years 10 months 24 days
Syntellis Performance Solutions, LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  | $ 1,381.0 |  |  |  |  |  |
Federal tax attributes |  |  |  |  | 135.0 |  |  |  |  |  |
Goodwill |  |  |  |  | 859.0 |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  | $ 594.0 |  |  |  |  |  |
Business combination, consideration tax benefit utilized over period |  |  |  |  | 15 years |  |  |  |  |  |
Syntellis Performance Solutions, LLC | Trade names |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, not subject to amortization |  |  |  |  | $ 17.0 |  |  |  |  |  |
Syntellis Performance Solutions, LLC | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  | $ 529.0 |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets (in years) |  |  |  |  | 20 years |  |  |  |  |  |
Syntellis Performance Solutions, LLC | Technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  | $ 65.0 |  |  |  |  |  |
Weighted average useful life of finite-lived intangible assets (in years) |  |  |  |  | 7 years |  |  |  |  |  |
Promium, LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  | $ 16.5 |  |  |  |
Certinia Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity investment |  |  |  |  |  |  |  |  | $ 245.6 |  |
Replicon Inc. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  | $ 447.5 |  |  |  |  |  |  |
Federal tax attributes |  |  |  | $ 80.0 |  |  |  |  |  |  |
Business combination, consideration tax benefit utilized over period |  |  |  | 15 years |  |  |  |  |  |  |
Executive Business Services, Inc. (“ProPricer”) |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  | $ 79.5 |  |  |  |  |  |  |  |
Frontline Technologies Parent LLC |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate purchase price |  |  |  |  |  |  |  | $ 3,738.0 |  |  |
Federal tax attributes |  |  |  |  |  |  |  | 350.0 |  | $ 500.0 |
Goodwill |  |  |  |  |  |  |  | 2,197.6 |  |  |
Other identifiable intangibles |  |  |  |  |  |  |  | $ 1,918.6 |  |  |
Deferred tax liabilities |  |  |  |  |  |  |  |  |  | 122.0 |
Enterprise value, adjusted for cash and the settlement of liabilities, net of tax benefit |  |  |  |  |  |  |  |  |  |  | $ 3,725.0
Business combination, consideration tax benefit utilized over period |  |  |  |  |  |  |  | 15 years |  |  |
Amortizable intangible assets |  |  |  |  |  |  |  | $ 1,835.6 |  |  |
Deferred tax assets (liabilities), net |  |  |  |  |  |  |  |  |  | 258.0 |
Goodwill, expected tax deductible amount |  |  |  |  |  |  |  |  |  | $ 1,200.0 |
Frontline Technologies Parent LLC | Trade names |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets acquired, not subject to amortization |  |  |  |  |  |  |  | 83.0 |  |  |
Frontline Technologies Parent LLC | Customer related intangibles |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  |  |  |  | $ 1,757.0 |  |  |
Weighted average useful life of finite-lived intangible assets (in years) |  |  |  |  |  |  |  | 20 years |  |  |
Frontline Technologies Parent LLC | Technology |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other identifiable intangibles |  |  |  |  |  |  |  | $ 78.6 |  |  |
Weighted average useful life of finite-lived intangible assets (in years) |  |  |  |  |  |  |  | 5 years |  |  |

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