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Goodwill and Intangible Assets (Tables) | 9 Months Ended
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Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Change in Goodwill | Change in goodwill:
|  | Nine Months Ended September 30,
|  | 2025 |  | 2024
January 1 |  | $ | 10,677.4 |  |  | $ | 10,082.3 |
Acquisitions |  | 2.5 |  |  | 751.1 |
Noncontrolling interests in acquired businesses |  | 2.6 |  |  | 24.4 |
Contingent purchase price obligations of acquired businesses |  | 2.6 |  |  | — |
Dispositions |  | (66.3) |  |  | (6.0) |
Foreign currency translation |  | 296.4 |  |  | 76.2 |
September 30 |  | $ | 10,915.2 |  |  | $ | 10,928.0 |
Intangible Assets | Intangible assets:
| September 30, 2025 |  | December 31, 2024
| Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Value
Acquired intangible assets and internally developed strategic platform assets | $ | 1,079.0 |  |  | $ | (623.4) |  |  | $ | 455.6 |  |  | $ | 1,096.1 |  |  | $ | (606.1) |  |  | $ | 490.0 |
Other purchased and internally developed software | 276.8 |  |  | (243.6) |  |  | 33.2 |  |  | 258.3 |  |  | (226.3) |  |  | 32.0 |
Total Intangible Assets | $ | 1,355.8 |  |  | $ | (867.0) |  |  | $ | 488.8 |  |  | $ | 1,354.4 |  |  | $ | (832.4) |  |  | $ | 522.0 |
Amortization of Intangible Assets | Amortization of intangible assets:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2025 |  | 2024 |  | 2025 |  | 2024
Acquired intangible assets and internally developed strategic platform assets | $ | 21.5 |  |  | $ | 22.2 |  |  | $ | 63.1 |  |  | $ | 65.2 |
Other purchased and internally developed software | 3.9 |  |  | 4.3 |  |  | 11.9 |  |  | 13.4 |
Amortization Expense | $ | 25.4 |  |  | $ | 26.5 |  |  | $ | 75.0 |  |  | $ | 78.6 |

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