Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Goodwill, net, beginning balance	$ 9,867.1
Acquisitions	19.5
Foreign currency translation	(193.1)
Goodwill	9,693.5	$ 9,867.1
Goodwill, Impaired, Accumulated Impairment Loss		(124.0)
Developed Markets Segment
Goodwill [Roll Forward]
Goodwill, net, beginning balance	7,107.4
Acquisitions	19.5
Foreign currency translation	(153.5)
Goodwill	6,973.4	7,107.4
Goodwill, Impaired, Accumulated Impairment Loss	(929.0)	(929.0)
Greater China
Goodwill [Roll Forward]
Goodwill, net, beginning balance	932.8
Acquisitions	0.0
Foreign currency translation	(7.5)
Goodwill	925.3	932.8
Japan, Australia and New Zealand Segment
Goodwill [Roll Forward]
Goodwill, net, beginning balance	645.7
Acquisitions	0.0
Foreign currency translation	(24.6)
Goodwill	621.1	645.7
Goodwill, Impaired, Accumulated Impairment Loss	(30.0)	(30.0)
Emerging Markets Segment
Goodwill [Roll Forward]
Goodwill, net, beginning balance	1,181.2
Acquisitions	0.0
Foreign currency translation	(7.5)
Goodwill	1,173.7	$ 1,181.2
Goodwill, Impaired, Accumulated Impairment Loss	$ (124.0)