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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Change in goodwill:
Nine Months Ended September 30,
20232022
January 1$9,734.3 $9,738.6 
Acquisitions30.6 212.8 
Noncontrolling interests in acquired businesses90.7 48.5 
Contingent purchase price obligations of acquired businesses170.1 8.7 
Dispositions(119.0)(19.6)
Foreign currency translation(17.3)(489.3)
September 30
$9,889.4 $9,499.7 
There were no goodwill impairment losses recorded in the nine months ended September 30, 2023 and 2022, and there are no accumulated goodwill impairment losses.
Intangible assets:
 September 30, 2023December 31, 2022
Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value		Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value
Purchased and internally
   developed software
$363.2 $(299.6)$63.6 $374.8 $(309.1)$65.7 
Customer related and other852.9 (531.6)321.3 758.5 (510.8)247.7 
Total Intangible Assets$1,216.1 $(831.2)$384.9 $1,133.3 $(819.9)$313.4 
We completed our annual goodwill impairment test as of May 1, 2023. 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 as of May 1, 2023 our goodwill was not impaired. In 2023, to better align with our internal financial processes, the date of our annual impairment test was changed from June 30 to May 1.