Fair Value (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Assets:
Short-term investments	$ 0.0		$ 60.7
Carrying Amount
Assets:
Cash and cash equivalents	2,769.6		4,281.8
Short-term investments	0.0		60.7
Marketable equity securities	0.8		0.9
Non-marketable equity securities	6.7		5.6
Liabilities:
Short-term debt	14.5		16.9
Foreign currency derivatives	0.0		0.1
Cross currency swaps - net investment hedge	0.6		16.5
Contingent purchase price obligations	292.2		115.0
Long-term debt	5,572.1		5,577.2
Fair Value
Assets:
Cash and cash equivalents	2,769.6		4,281.8
Short-term investments	0.0		60.7
Marketable equity securities	0.8		0.9
Non-marketable equity securities	6.7		5.6
Liabilities:
Short-term debt	14.5		16.9
Foreign currency derivatives	0.0		0.1
Cross currency swaps - net investment hedge	0.6		16.5
Contingent purchase price obligations	292.2		115.0
Long-term debt	4,897.2		4,993.4
Contingent purchase price obligations
Changes in Level 3 Fair Value Measurements [Roll Forward]
January 1	115.0	$ 167.1
Acquisitions	230.0	10.7
Revaluation and interest	(18.2)	0.0
Payments	(34.8)	(32.7)
Foreign currency translation	0.2	(8.0)
September 30	292.2	$ 137.1
Fair Value, Recurring [Member]
Assets:
Cash and cash equivalents	2,769.6		4,281.8
Short-term investments	0.0		60.7
Marketable equity securities	0.8		0.9
Liabilities:
Foreign currency derivatives	0.0		0.1
Cross currency swaps - net investment hedge	0.6		16.5
Contingent purchase price obligations	292.2		115.0
Fair Value, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	2,769.6		4,281.8
Marketable equity securities	0.8		0.9
Fair Value, Recurring [Member] | Level 2
Assets:
Short-term investments	0.0		60.7
Liabilities:
Foreign currency derivatives	0.0		0.1
Cross currency swaps - net investment hedge	0.6		16.5
Fair Value, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 292.2		$ 115.0