Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Carrying Amount
Assets:
Cash and cash equivalents	$ 3,378.3		$ 4,339.4
Marketable equity securities	0.9		0.9
Non-marketable equity securities	37.0		36.8
Cross currency swaps - net investment hedge	6.1		9.3
Liabilities:
Short-term debt	19.1		21.3
Foreign currency derivatives	0.0		0.1
Contingent purchase price obligations	223.1		220.1
Long-term debt	6,116.5		6,035.3
Fair Value
Assets:
Cash and cash equivalents	3,378.3		4,339.4
Marketable equity securities	0.9		0.9
Non-marketable equity securities	37.0		36.8
Cross currency swaps - net investment hedge	6.1		9.3
Liabilities:
Short-term debt	19.1		21.3
Foreign currency derivatives	0.0		0.1
Contingent purchase price obligations	223.1		220.1
Long-term debt	5,780.1		5,664.9
Contingent purchase price obligations
Changes in Contingent Purchase Price Obligations [Roll Forward]
January 1	220.1	$ 229.5
Acquisitions	2.8	26.5
Revaluation and interest	3.1	3.2
Payments	(2.8)	(0.5)
Foreign currency translation	(0.1)	(0.1)
March 31	223.1	$ 258.6
Fair Value, Recurring [Member]
Assets:
Cash and cash equivalents	3,378.3		4,339.4
Marketable equity securities	0.9		0.9
Cross currency swaps - net investment hedge	6.1		9.3
Liabilities:
Foreign currency derivatives			0.1
Contingent purchase price obligations	223.1		220.1
Fair Value, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	3,378.3		4,339.4
Marketable equity securities	0.9		0.9
Fair Value, Recurring [Member] | Level 2
Assets:
Cross currency swaps - net investment hedge	6.1		9.3
Liabilities:
Foreign currency derivatives			0.1
Fair Value, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 223.1		$ 220.1