Goodwill and other intangible assets - goodwill (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes to goodwill
Beginning balance, net	$ 5,341.1	$ 2,860.2
Currency translation	(120.3)	(127.2)
Additions	431.8	2,608.1
Ending balance, net	5,652.6	5,341.1
Accumulated impairment of goodwill
Ending balance, net	5,652.6	5,341.1
Accumulated impairment losses	38.8	38.8
Ending balance, gross	5,691.4	5,379.9
Americas
Changes to goodwill
Beginning balance, net	3,411.4	1,611.6
Currency translation	(7.7)	0.8
Additions	427.1	1,799.0
Ending balance, net	3,830.8	3,411.4
Accumulated impairment of goodwill
Ending balance, net	3,830.8	3,411.4
Accumulated impairment losses	21.0	21.0
Ending balance, gross	3,851.8	3,432.4
Europe
Changes to goodwill
Beginning balance, net	1,897.9	1,218.5
Currency translation	(111.1)	(127.6)
Additions	0.6	807.0
Ending balance, net	1,787.4	1,897.9
Accumulated impairment of goodwill
Ending balance, net	1,787.4	1,897.9
Accumulated impairment losses	6.7	6.7
Ending balance, gross	1,794.1	1,904.6
AMEA
Changes to goodwill
Beginning balance, net	31.8	30.1
Currency translation	(1.5)	(0.4)
Additions	4.1	2.1
Ending balance, net	34.4	31.8
Accumulated impairment of goodwill
Ending balance, net	34.4	31.8
Accumulated impairment losses	11.1	11.1
Ending balance, gross	$ 45.5	$ 42.9