Goodwill and Intangible Assets - Changes in Goodwill (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Goodwill [Roll Forward]
Gross carrying value of goodwill, beginning balance	$ 8,178.0
Accumulated impairment losses	(2,882.1)	$ (2,886.1)
Balance, beginning of the year	5,291.9
Acquisition (2)	29.3
Foreign currency translation, net	(0.4)
Gross carrying value of goodwill, ending balance	8,202.9
Balance, ending of the year	5,320.8
Americas
Goodwill [Roll Forward]
Gross carrying value of goodwill, beginning balance	6,790.4
Accumulated impairment losses	(1,497.4)	(1,498.5)
Balance, beginning of the year	5,291.9
Acquisition (2)	29.3
Foreign currency translation, net	(0.4)
Gross carrying value of goodwill, ending balance	6,818.2
Balance, ending of the year	5,320.8
EMEA&APAC
Goodwill [Roll Forward]
Gross carrying value of goodwill, beginning balance	1,387.6
Accumulated impairment losses	(1,384.7)	$ (1,387.6)
Balance, beginning of the year	0.0
Acquisition (2)	0.0
Foreign currency translation, net	0.0
Gross carrying value of goodwill, ending balance	1,384.7
Balance, ending of the year	$ 0.0