Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Liabilities:
Contingent purchase price obligations	$ 220.1	$ 229.5
Carrying Amount
Assets:
Cash and cash equivalents	4,339.4	4,432.0
Marketable equity securities	0.9	0.9
Non-marketable equity securities	36.8	6.7
Cross currency swaps - net investment hedge	9.3	0.0
Liabilities:
Short-term debt	21.3	10.9
Foreign currency derivatives	0.1	0.0
Cross currency swaps - net investment hedge	0.0	6.6
Contingent purchase price obligations	220.1	229.5
Long-term debt	6,035.3	5,639.6
Fair Value
Assets:
Cash and cash equivalents	4,339.4	4,432.0
Marketable equity securities	0.9	0.9
Non-marketable equity securities	36.8	6.7
Cross currency swaps - net investment hedge	9.3	0.0
Liabilities:
Short-term debt	21.3	10.9
Foreign currency derivatives	0.1	0.0
Cross currency swaps - net investment hedge	0.0	6.6
Contingent purchase price obligations	220.1	229.5
Long-term debt	5,664.9	5,237.8
Contingent purchase price obligations
Changes in Contingent Purchase Price Obligations [Roll Forward]
January 1	229.5	115.0
Acquisitions	39.2	217.4
Revaluation and interest	(5.1)	(36.1)
Payments	(42.4)	(67.7)
Foreign currency translation	(1.1)	0.9
December 31	220.1	229.5
Fair Value, Recurring [Member]
Assets:
Cash and cash equivalents	4,339.4	4,432.0
Marketable equity securities	0.9	0.9
Cross currency swaps - net investment hedge	9.3
Liabilities:
Foreign currency derivatives	0.1
Cross currency swaps - net investment hedge		6.6
Contingent purchase price obligations	220.1	229.5
Fair Value, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	4,339.4	4,432.0
Marketable equity securities	0.9	0.9
Fair Value, Recurring [Member] | Level 2
Assets:
Cross currency swaps - net investment hedge	9.3
Liabilities:
Foreign currency derivatives	0.1
Cross currency swaps - net investment hedge		6.6
Fair Value, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 220.1	$ 229.5