Goodwill - Goodwill by Reportable Segment (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Goodwill [Line Items]
Goodwill, gross, Beginning balance	$ 6,005.1		$ 5,999.5
Goodwill	4,078.0		4,072.4
Additions (Deductions)	0.0
Impairment	0.0	$ 0.0
Foreign exchange and other	5.6
Goodwill, gross, Ending balance	6,005.1
Accumulated impairment losses	(1,927.1)		(1,927.1)
CCS [Member]
Goodwill [Line Items]
Goodwill, gross, Beginning balance	2,284.9		2,280.9
Goodwill	2,233.4		2,229.4
Additions (Deductions)	0.0
Impairment	0.0
Foreign exchange and other	4.0
Goodwill, gross, Ending balance	2,284.9
Accumulated impairment losses	(51.5)		(51.5)
OWN [Member]
Goodwill [Line Items]
Goodwill, gross, Beginning balance	661.3		660.3
Goodwill	501.8		500.8
Additions (Deductions)	0.0
Impairment	0.0
Foreign exchange and other	1.0
Goodwill, gross, Ending balance	661.3
Accumulated impairment losses	(159.5)		(159.5)
NICS [Member]
Goodwill [Line Items]
Goodwill, gross, Beginning balance	649.9		649.4
Goodwill	608.7		608.2
Additions (Deductions)	0.0
Impairment	0.0
Foreign exchange and other	0.5
Goodwill, gross, Ending balance	649.9
Accumulated impairment losses	(41.2)		(41.2)
ANS [Member]
Goodwill [Line Items]
Goodwill, gross, Beginning balance	1,995.8		1,995.7
Goodwill	734.1		734.0
Additions (Deductions)	0.0
Impairment	0.0
Foreign exchange and other	0.1
Goodwill, gross, Ending balance	1,995.8
Accumulated impairment losses	(1,261.7)		(1,261.7)
Home [Member]
Goodwill [Line Items]
Goodwill, gross, Beginning balance	413.2		413.2
Goodwill			0.0
Additions (Deductions)	0.0
Impairment	0.0
Foreign exchange and other	0.0
Goodwill, gross, Ending balance	413.2
Accumulated impairment losses	$ (413.2)		$ (413.2)