Goodwill and Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2025

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

Change in goodwill:

	Three Months Ended March 31,
	2025		2024
January 1	$	10,677.4	$	10,082.3
Acquisitions	2.4		688.3
Noncontrolling interests in acquired businesses	2.5		—
Contingent purchase price obligations of acquired businesses	2.4		—
Dispositions	(20.6)		(5.9)
Foreign currency translation	117.4		(70.9)
March 31	$	10,781.5	$	10,693.8

Intangible Assets

Intangible assets:

	March 31, 2025						December 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

Amortization of intangible assets:

	Three Months Ended March 31,
	2025		2024
Acquired intangible assets and internally developed strategic platform assets	$	21.8	$	21.5
Other purchased and internally developed software	4.0		4.3
Amortization Expense	$	25.8	$	25.8