Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Assets:
Short-term investments	$ 92.7		$ 0.0
Carrying Amount
Assets:
Cash and cash equivalents	3,925.5		5,316.8
Short-term investments	92.7		0.0
Marketable equity securities	0.9		1.1
Non-marketable equity securities	5.6		6.5
Foreign currency derivatives	0.0		0.3
Liabilities:
Short-term debt	12.4		9.6
Foreign currency derivatives	0.0		0.1
Contingent purchase price obligations	160.6		167.1
Long-term debt	5,646.4		5,685.7
Fair Value
Assets:
Cash and cash equivalents	3,925.5		5,316.8
Short-term investments	92.7		0.0
Marketable equity securities	0.9		1.1
Non-marketable equity securities	5.6		6.5
Foreign currency derivatives	0.0		0.3
Liabilities:
Short-term debt	12.4		9.6
Foreign currency derivatives	0.0		0.1
Contingent purchase price obligations	160.6		167.1
Long-term debt	5,561.3		6,011.6
Contingent purchase price obligations
Changes in Contingent Purchase Price Obligations [Roll Forward]
January 1	167.1	$ 71.9
Acquisitions	0.5	1.3
Revaluation and interest	0.2	0.4
Payments	(6.0)	(5.4)
Foreign currency translation	(1.2)	(0.5)
March 31	160.6	$ 67.7
Fair Value, Recurring [Member]
Assets:
Cash and cash equivalents	3,925.5		5,316.8
Short-term investments	92.7
Marketable equity securities	0.9		1.1
Foreign currency derivatives			0.3
Liabilities:
Foreign currency derivatives			0.1
Contingent purchase price obligations	160.6		167.1
Fair Value, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	3,925.5		5,316.8
Marketable equity securities	0.9		1.1
Fair Value, Recurring [Member] | Level 2
Assets:
Short-term investments	92.7
Foreign currency derivatives			0.3
Liabilities:
Foreign currency derivatives			0.1
Fair Value, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 160.6		$ 167.1