GOODWILL AND OTHER INTANGIBLE ASSETS - Changes in the Carrying Value of Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Goodwill, beginning balance		$ 12,956.7	$ 13,350.1
Adjustments			(71.7)
Other		(20.7)	(7.4)
Impairments	$ (322.0)	(402.0)	0.0	$ 0.0
Effect of foreign currency translation		105.0	(314.3)
Goodwill, ending balance		12,639.0	12,956.7	13,350.1
India
Goodwill [Roll Forward]
Impairments		(322.0)
Spain
Goodwill [Roll Forward]
Impairments		(80.0)
U.S. & Canada
Goodwill [Roll Forward]
Goodwill, beginning balance		4,637.5	4,648.4
Adjustments			0.0
Other		0.0	(7.4)
Impairments		0.0
Effect of foreign currency translation		1.1	(3.5)
Goodwill, ending balance		4,638.6	4,637.5	4,648.4
Asia-Pacific
Goodwill [Roll Forward]
Goodwill, beginning balance		889.2	990.1
Adjustments			0.0
Other		0.0	0.0
Impairments		(322.0)
Effect of foreign currency translation		(4.5)	(100.9)
Goodwill, ending balance		562.7	889.2	990.1
Africa
Goodwill [Roll Forward]
Goodwill, beginning balance		548.5	612.2
Adjustments			0.0
Other		0.0	0.0
Impairments		0.0
Effect of foreign currency translation		(50.8)	(63.7)
Goodwill, ending balance		497.7	548.5	612.2
Europe
Goodwill [Roll Forward]
Goodwill, beginning balance		3,044.0	3,230.4
Adjustments			3.6
Other		0.0	0.0
Impairments		(80.0)
Effect of foreign currency translation		87.9	(190.0)
Goodwill, ending balance		3,051.9	3,044.0	3,230.4
Latin America
Goodwill [Roll Forward]
Goodwill, beginning balance		915.5	888.6
Adjustments			(16.9)
Other		(20.7)	0.0
Impairments		0.0
Effect of foreign currency translation		71.3	43.8
Goodwill, ending balance		966.1	915.5	888.6
Data Centers
Goodwill [Roll Forward]
Goodwill, beginning balance		2,920.0	2,978.4
Adjustments			(58.4)
Other		0.0	0.0
Impairments		0.0
Effect of foreign currency translation		0.0	0.0
Goodwill, ending balance		2,920.0	2,920.0	2,978.4
Services
Goodwill [Roll Forward]
Goodwill, beginning balance		2.0	2.0
Adjustments			0.0
Other		0.0	0.0
Impairments		0.0
Effect of foreign currency translation		0.0	0.0
Goodwill, ending balance		$ 2.0	$ 2.0	$ 2.0