Goodwill and Intangible Assets (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Changes in Goodwill
Goodwill, January 1	$ 9,734.3	$ 9,738.6
Goodwill, Acquisitions	3.2	201.1
Goodwill, Noncontrolling interests in acquired businesses	0.0	47.9
Goodwill, Contingent purchase price obligations of acquired businesses	3.3	0.0
Goodwill, Dispositions	(118.6)	(19.6)
Goodwill, Foreign currency translation	81.2	(266.2)
Goodwill, June 30	9,703.4	9,701.8
Goodwill, impairment losses	0.0	$ 0.0
Goodwill, accumulated impairment losses	0.0
Intangible assets:
Intangible assets, Gross Carrying Value	1,112.1		$ 1,133.3
Intangible assets, Accumulated Amortization	(823.1)		(819.9)
Intangible assets, Net Carrying Value	289.0		313.4
Purchased and internally developed software
Intangible assets:
Intangible assets, Gross Carrying Value	361.3		374.8
Intangible assets, Accumulated Amortization	(297.5)		(309.1)
Intangible assets, Net Carrying Value	63.8		65.7
Customer related and other
Intangible assets:
Intangible assets, Gross Carrying Value	750.8		758.5
Intangible assets, Accumulated Amortization	(525.6)		(510.8)
Intangible assets, Net Carrying Value	$ 225.2		$ 247.7