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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2026
Intangible Asset, Goodwill and Other [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Change in goodwill:
Three Months Ended March 31,
20262025
January 1$18,641.4 $10,677.4 
Acquisitions*
118.1 2.4 
Noncontrolling interests in acquired businesses17.0 2.5 
Contingent purchase price obligations of acquired businesses13.5 2.4 
Dispositions(7.8)(20.6)
Foreign currency translation(48.3)117.4 
March 31
$18,733.9 $10,781.5 
*The increase in goodwill in the three months ended March 31, 2026 is primarily attributable to adjustments to the preliminary purchase price accounting for the IPG acquisition in November 2025 (see Note 5 to the consolidated financial statements). There were no goodwill impairment charges recorded in the three months ended March 31, 2026 and 2025, and there are no accumulated goodwill impairment charges.
Intangible assets:
 March 31, 2026December 31, 2025
Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value		Gross
Carrying
Value		Accumulated
Amortization		Net
Carrying
Value
Trade Names
$926.0 $(96.4)$829.6 $929.9 $(76.5)$853.4 
Customer Relationships
4,374.0 (578.2)3,795.8 4,389.5 (504.1)3,885.4 
Technology and Other
355.6 (94.3)261.3 409.2 (79.6)329.6 
Acquired intangible assets and internally developed strategic platform assets
$5,655.6 $(768.9)$4,886.7 $5,728.6 $(660.2)$5,068.4 
Other purchased and internally developed software
303.8 (245.3)58.5 275.6 (243.0)32.6 
Intangible Assets
$5,959.4 $(1,014.2)$4,945.2 $6,004.2 $(903.2)$5,101.0 
Amortization of intangible assets:
Three Months Ended March 31,
20262025
Acquired intangible assets and internally developed strategic platform assets$110.9 $21.8 
Other purchased and internally developed software6.5 4.0 
Amortization Expense$117.4 $25.8