Goodwill and Intangible Assets - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2020	Sep. 30, 2020
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 11,253.3	$ 11,253.3
Accumulated impairment losses, Beginning Balance	(1,653.6)	(1,653.6)
Goodwill, net of accumulated impairment losses, Beginning Balance	9,599.7	9,599.7
Purchase accounting adjustments		0.2
Impairment		(612.0)
Currency translation		50.9
Goodwill, Ending Balance		11,304.4
Accumulated impairment losses, Ending Balance		(2,265.6)
Goodwill, net of accumulated impairment losses, Ending Balance		9,038.8
Americas [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	7,699.8	7,699.8
Goodwill, net of accumulated impairment losses, Beginning Balance	7,699.8	7,699.8
Goodwill reportable segment change		1,661.3
Accumulated impairment losses reportable segment change		(1,086.6)
Purchase accounting adjustments		0.2
Impairment		(142.0)
Currency translation		39.6
Goodwill, Ending Balance		9,400.9
Accumulated impairment losses, Ending Balance		(1,228.6)
Goodwill, net of accumulated impairment losses, Ending Balance		8,172.3
EMEA [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,316.8	1,316.8
Accumulated impairment losses, Beginning Balance	(567.0)	(567.0)
Goodwill, net of accumulated impairment losses, Beginning Balance	749.8	749.8
Goodwill reportable segment change		17.0
Impairment	(470.0)	(470.0)
Currency translation		6.9
Goodwill, Ending Balance		1,340.7
Accumulated impairment losses, Ending Balance		(1,037.0)
Goodwill, net of accumulated impairment losses, Ending Balance		303.7
Asia Pacific [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	507.4	507.4
Goodwill, net of accumulated impairment losses, Beginning Balance	507.4	507.4
Goodwill reportable segment change		51.0
Currency translation		4.4
Goodwill, Ending Balance		562.8
Goodwill, net of accumulated impairment losses, Ending Balance		562.8
Immaterial Product Category Operating Segments [Member]
Goodwill [Line Items]
Goodwill, Beginning Balance	1,729.3	1,729.3
Accumulated impairment losses, Beginning Balance	(1,086.6)	(1,086.6)
Goodwill, net of accumulated impairment losses, Beginning Balance	$ 642.7	642.7
Goodwill reportable segment change		(1,729.3)
Accumulated impairment losses reportable segment change		$ 1,086.6