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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Change in goodwill:
Three Months Ended March 31,
20252024
January 1$10,677.4 $10,082.3 
Acquisitions2.4 688.3 
Noncontrolling interests in acquired businesses2.5 — 
Contingent purchase price obligations of acquired businesses2.4 — 
Dispositions(20.6)(5.9)
Foreign currency translation117.4 (70.9)
March 31
$10,781.5 $10,693.8 
The increase in goodwill in the three months ended March 31, 2024 is primarily attributable to the acquisition of Flywheel Digital in January 2024. There were no goodwill impairment charges recorded in the three months ended March 31, 2025 and 2024, and there are no accumulated goodwill impairment charges.
Intangible assets:
 March 31, 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
$1,095.6 $(614.7)$480.9 $1,096.1 $(606.1)$490.0 
Other purchased and internally
   developed software		272.5 (240.5)32.0 258.3 (226.3)32.0 
Total Intangible Assets$1,368.1 $(855.2)$512.9 $1,354.4 $(832.4)$522.0 
Amortization of intangible assets:
Three Months Ended March 31,
20252024
Acquired intangible assets and internally developed strategic platform assets$21.8 $21.5 
Other purchased and internally developed software4.0 4.3 
Amortization Expense$25.8 $25.8