Goodwill and Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2024

Goodwill and Intangible Assets Disclosure [Abstract]

Change in Goodwill

Change in goodwill:

	December 31,
	2024		2023
January 1	$	10,082.3	$	9,734.3
Acquisitions	761.2		51.7
Noncontrolling interests in acquired businesses	22.8		128.6
Contingent purchase price obligations of acquired businesses	—		159.7
Dispositions	(6.0)		(120.6)
Foreign currency translation	(182.9)		128.6
December 31	$	10,677.4	$	10,082.3

Intangible Assets

Intangible assets:

	December 31,
	2024						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	$	1,096.1	$	(606.1)	$	490.0	$	902.6	$	(572.9)	$	329.7
Other purchased and internally    developed software	258.3		(226.3)		32.0		327.9		(290.7)		37.2
Intangible Assets	$	1,354.4	$	(832.4)	$	522.0	$	1,230.5	$	(863.6)	$	366.9

Amortization of Intangible Assets

Amortization of intangible assets:

	Year Ended December 31,
	2024		2023		2022
Acquired intangible assets and internally developed    strategic platform assets	$	87.5	$	61.8	$	58.8
Other purchased and internally developed software	18.1		18.5		21.5
Amortization Expense	$	105.6	$	80.3	$	80.3