Goodwill and Other Intangible Assets - Changes in Carrying Amount of Goodwill Related to Continuing Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 10,153.0	$ 9,914.7
Accumulated impairment losses, Beginning Balance	(1,334.5)	(1,334.5)
Goodwill, net of accumulated impairment losses, Beginning Balance	8,818.5	8,580.2
Acquisitions	200.6	215.0
Currency translation	(68.0)	23.3
Goodwill, Ending Balance	10,285.6	10,153.0
Accumulated impairment losses, Ending Balance	(1,334.5)	(1,334.5)
Goodwill, net of accumulated impairment losses, Ending Balance	8,951.1	8,818.5
Americas [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	8,273.5	8,043.3
Accumulated impairment losses, Beginning Balance	(7.7)	(7.7)
Goodwill, net of accumulated impairment losses, Beginning Balance	8,265.8	8,035.6
Acquisitions	156.5	201.4
Currency translation	(53.2)	28.8
Goodwill, Ending Balance	8,376.8	8,273.5
Accumulated impairment losses, Ending Balance	(7.7)	(7.7)
Goodwill, net of accumulated impairment losses, Ending Balance	8,369.1	8,265.8
EMEA [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,326.8	1,326.8
Accumulated impairment losses, Beginning Balance	(1,326.8)	(1,326.8)
Acquisitions	44.1
Currency translation	(0.4)
Goodwill, Ending Balance	1,370.5	1,326.8
Accumulated impairment losses, Ending Balance	(1,326.8)	(1,326.8)
Goodwill, net of accumulated impairment losses, Ending Balance	43.7
Asia Pacific [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	552.7	544.6
Goodwill, net of accumulated impairment losses, Beginning Balance	552.7	544.6
Acquisitions		13.6
Currency translation	(14.4)	(5.5)
Goodwill, Ending Balance	538.3	552.7
Goodwill, net of accumulated impairment losses, Ending Balance	$ 538.3	$ 552.7