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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Change in goodwill:
Nine Months Ended September 30,
20242023
January 1$10,082.3 $9,734.3 
Acquisitions751.1 30.6 
Noncontrolling interests in acquired businesses24.4 90.7 
Contingent purchase price obligations of acquired businesses— 170.1 
Dispositions(6.0)(119.0)
Foreign currency translation76.2 (17.3)
September 30
$10,928.0 $9,889.4 
The increase in goodwill during the nine months ended September 30, 2024 is primarily attributable to the acquisition of Flywheel Digital. There were no goodwill impairment charges recorded in the nine months ended September 30, 2024 and 2023, and there are no accumulated goodwill impairment charges.
Intangible assets:
 September 30, 2024December 31, 2023
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
$1,136.2 $(629.4)$506.8 $902.6 $(572.9)$329.7 
Other purchased and internally
   developed software		282.7 (250.1)32.6 327.9 (290.7)37.2 
Total Intangible Assets$1,418.9 $(879.5)$539.4 $1,230.5 $(863.6)$366.9 
Amortization of intangible assets:
Three Months Ended September 30,Nine Months Ended September 30,
2024202320242023
Acquired intangible assets and internally developed
   strategic platform assets		$22.2 $15.7 $65.2 $45.2 
Other purchased and internally developed software4.3 4.6 13.4 13.7 
Amortization Expense$26.5 $20.3 $78.6 $58.9 
We completed our annual goodwill impairment test as of May 1, 2024. 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, 2024 our goodwill was not impaired.