Goodwill and Intangible Assets (Changes in Carrying Amount of Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Goodwill [Roll Forward]
Goodwill, net, beginning balance			$ 9,133.3
Impairment of goodwill	$ 0.0	$ 321.0	2,936.8	$ 321.0
Foreign currency translation			551.8
Goodwill	6,748.3		6,748.3		$ 9,133.3
Developed Markets Segment
Goodwill [Roll Forward]
Goodwill, net, beginning balance			6,752.9
Impairment of goodwill			2,261.0
Foreign currency translation			527.3
Goodwill	5,019.2		5,019.2		6,752.9
Accumulated impairment loss	(3,190.0)		(3,190.0)		(929.0)
Greater China
Goodwill [Roll Forward]
Goodwill, net, beginning balance			921.5
Impairment of goodwill			0.0
Foreign currency translation			6.3
Goodwill	927.8		927.8		921.5
Japan, Australia and New Zealand Segment
Goodwill [Roll Forward]
Goodwill, net, beginning balance			295.1
Impairment of goodwill		$ 321.0	300.8
Foreign currency translation			5.7
Goodwill	0.0		0.0		295.1
Accumulated impairment loss	(651.8)		(651.8)		(351.0)
Emerging Markets Segment
Goodwill [Roll Forward]
Goodwill, net, beginning balance			1,163.8
Impairment of goodwill			375.0
Foreign currency translation			12.5
Goodwill	801.3		801.3		1,163.8
Accumulated impairment loss	$ (499.0)		$ (499.0)		$ (124.0)