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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Change in goodwill:
Nine Months Ended September 30,
20252024
January 1$10,677.4 $10,082.3 
Acquisitions2.5 751.1 
Noncontrolling interests in acquired businesses2.6 24.4 
Contingent purchase price obligations of acquired businesses2.6 — 
Dispositions(66.3)(6.0)
Foreign currency translation296.4 76.2 
September 30
$10,915.2 $10,928.0 
The increase in goodwill in the nine months ended September 30, 2024 is primarily attributable to the acquisition of Flywheel Digital in January 2024. There were no goodwill impairment charges recorded in the nine months ended September 30, 2025 and 2024, and there are no accumulated goodwill impairment charges.
We completed our annual goodwill impairment test as of May 1, 2025. The market assumptions used in our assessment reflected the current economic environment (see Note 1- Risks and Uncertainties). Based on the results of our impairment test, we concluded that at May 1, 2025 our goodwill was not impaired. There were no events through September 30, 2025 that would change our impairment assessments.
Intangible assets:
 September 30, 2025December 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:
Three Months Ended September 30,Nine Months Ended September 30,
2025202420252024
Acquired intangible assets and internally developed strategic platform assets$21.5 $22.2 $63.1 $65.2 
Other purchased and internally developed software3.9 4.3 11.9 13.4 
Amortization Expense$25.4 $26.5 $75.0 $78.6