Fair Value (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Carrying Amount
Assets:
Cash and cash equivalents	$ 3,533.9		$ 4,432.0
Marketable equity securities	1.0		0.9
Non-marketable equity securities	11.2		6.7
Foreign currency derivatives	0.3		0.0
Liabilities:
Short-term debt	16.9		10.9
Cross currency swaps - net investment hedge	0.6		6.6
Contingent purchase price obligations	236.4		229.5
Long-term debt	6,930.1		5,639.6
Fair Value
Assets:
Cash and cash equivalents	3,533.9		4,432.0
Marketable equity securities	1.0		0.9
Non-marketable equity securities	11.2		6.7
Foreign currency derivatives	0.3		0.0
Liabilities:
Short-term debt	16.9		10.9
Cross currency swaps - net investment hedge	0.6		6.6
Contingent purchase price obligations	236.4		229.5
Long-term debt	6,676.3		5,237.8
Contingent purchase price obligations
Changes in Level 3 Fair Value Measurements [Roll Forward]
January 1	229.5	$ 115.0
Acquisitions	28.5	230.0
Revaluation and interest	1.9	(18.2)
Payments	(23.6)	(34.8)
Foreign currency translation	0.1	0.2
September 30	236.4	$ 292.2
Fair Value, Recurring [Member]
Assets:
Cash and cash equivalents	3,533.9		4,432.0
Marketable equity securities	1.0		0.9
Foreign currency derivatives	0.3		0.0
Liabilities:
Cross currency swaps - net investment hedge	0.6		6.6
Contingent purchase price obligations	236.4		229.5
Fair Value, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	3,533.9		4,432.0
Marketable equity securities	1.0		0.9
Fair Value, Recurring [Member] | Level 2
Assets:
Foreign currency derivatives	0.3		0.0
Liabilities:
Cross currency swaps - net investment hedge	0.6		6.6
Fair Value, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 236.4		$ 229.5