Goodwill (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 01, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Goodwill
Goodwill	$ 4,908.7	$ 5,050.6	$ 4,908.7	$ 4,945.5
Goodwill, Transfers	0.0
Current year acquisitions/(dispositions)		203.0	(0.2)
Foreign currency and other		(61.1)	(36.6)
IAN
Goodwill
Goodwill	0.0	0.0	4,231.6	4,264.5
Goodwill, Transfers	(4,231.6)
Current year acquisitions/(dispositions)		0.0	(0.2)
Foreign currency and other		0.0	(32.7)
DXTRA
Goodwill
Goodwill	0.0	0.0	677.1	681.0
Goodwill, Transfers	(677.1)
Current year acquisitions/(dispositions)		0.0	0.0
Foreign currency and other		0.0	(3.9)
MD&E
Goodwill
Goodwill	2,293.0	2,484.6	0.0	0.0
Goodwill, Transfers	2,293.0
Current year acquisitions/(dispositions)		209.5	0.0
Foreign currency and other		(17.9)	0.0
IA&C
Goodwill
Goodwill	1,920.2	1,881.6	0.0	0.0
Goodwill, Transfers	1,920.2
Current year acquisitions/(dispositions)		(6.5)	0.0
Foreign currency and other		(32.1)	0.0
SC&E
Goodwill
Goodwill	695.5	684.4	0.0	$ 0.0
Goodwill, Transfers	$ 695.5
Current year acquisitions/(dispositions)		0.0	0.0
Foreign currency and other		$ (11.1)	$ 0.0