Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023
Carrying Amount
Assets:
Cash and cash equivalents	$ 3,172.8		$ 4,432.0
Marketable equity securities	0.8		0.9
Cross currency swaps - net investment hedge	4.2		0.0
Non-marketable equity securities	12.5		6.7
Liabilities:
Short-term debt	11.2		10.9
Cross currency swaps - net investment hedge	0.0		6.6
Contingent purchase price obligations	258.6		229.5
Long-term debt	6,251.3		5,639.6
Fair Value
Assets:
Cash and cash equivalents	3,172.8		4,432.0
Marketable equity securities	0.8		0.9
Cross currency swaps - net investment hedge	4.2		0.0
Non-marketable equity securities	12.5		6.7
Liabilities:
Short-term debt	11.2		10.9
Cross currency swaps - net investment hedge	0.0		6.6
Contingent purchase price obligations	258.6		229.5
Long-term debt	5,822.1		5,237.8
Contingent purchase price obligations
Changes in Level 3 Fair Value Measurements [Roll Forward]
January 1	229.5	$ 115.0
Acquisitions	26.5	21.6
Revaluation and interest	3.2	0.4
Payments	(0.5)	(9.2)
Foreign currency translation	(0.1)	0.2
March 31	258.6	$ 128.0
Fair Value, Recurring [Member]
Assets:
Cash and cash equivalents	3,172.8		4,432.0
Marketable equity securities	0.8		0.9
Cross currency swaps - net investment hedge	4.2		0.0
Liabilities:
Cross currency swaps - net investment hedge	0.0		6.6
Contingent purchase price obligations	258.6		229.5
Fair Value, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	3,172.8		4,432.0
Marketable equity securities	0.8		0.9
Fair Value, Recurring [Member] | Level 2
Assets:
Cross currency swaps - net investment hedge	4.2		0.0
Liabilities:
Cross currency swaps - net investment hedge	0.0		6.6
Fair Value, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 258.6		$ 229.5