Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Changes in Goodwill
Goodwill, January 1	$ 10,082.3	$ 9,734.3
Goodwill, Acquisitions	688.3	0.0
Goodwill, Dispositions	(5.9)	(1.4)
Goodwill, Foreign currency translation	(70.9)	59.7
Goodwill, March 31	10,693.8	9,792.6
Goodwill, impairment losses	0.0	0.0
Goodwill, accumulated impairment losses	0.0
Intangible assets:
Intangible assets, Gross Carrying Value	1,390.5		$ 1,230.5
Intangible assets, Accumulated Amortization	(857.5)		(863.6)
Intangible assets, Net Carrying Value	533.0		366.9
Amortization of intangible assets	25.8	19.3
Acquired intangible assets and internally developed strategic platform assets
Intangible assets:
Intangible assets, Gross Carrying Value	1,084.3		902.6
Intangible assets, Accumulated Amortization	(585.6)		(572.9)
Intangible assets, Net Carrying Value	498.7		329.7
Amortization of intangible assets	21.5	14.8
Other purchased and internally developed software
Intangible assets:
Intangible assets, Gross Carrying Value	306.2		327.9
Intangible assets, Accumulated Amortization	(271.9)		(290.7)
Intangible assets, Net Carrying Value	34.3		$ 37.2
Amortization of intangible assets	$ 4.3	$ 4.5