Fair Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Liabilities:
Contingent purchase price obligations	$ 167.1	$ 71.9
Carrying Amount
Assets:
Cash and cash equivalents	5,316.8	5,600.5
Marketable equity securities	1.1	1.6
Non-marketable equity securities	6.5	8.9
Foreign currency derivatives	0.3	0.6
Liabilities:
Short-term debt	9.6	3.9
Foreign currency derivatives	0.1	0.3
Contingent purchase price obligations	167.1	71.9
Long-term debt	5,685.7	5,807.3
Fair Value
Assets:
Cash and cash equivalents	5,316.8	5,600.5
Marketable equity securities	1.1	1.6
Non-marketable equity securities	6.5	8.9
Foreign currency derivatives	0.3	0.6
Liabilities:
Short-term debt	9.6	3.9
Foreign currency derivatives	0.1	0.3
Contingent purchase price obligations	167.1	71.9
Long-term debt	6,011.6	6,380.6
Contingent purchase price obligations
Changes in Contingent Purchase Price Obligations [Roll Forward]
January 1	71.9	107.7
Acquisitions	120.4	14.4
Revaluation and interest	0.4	(21.9)
Payments	(22.6)	(31.3)
Foreign currency translation	(3.0)	3.0
December 31	167.1	71.9
Fair Value, Recurring [Member]
Assets:
Cash and cash equivalents	5,316.8	5,600.5
Marketable equity securities	1.1	1.6
Foreign currency derivatives	0.3	0.6
Liabilities:
Foreign currency derivatives	0.1	0.3
Contingent purchase price obligations	167.1	71.9
Fair Value, Recurring [Member] | Level 1
Assets:
Cash and cash equivalents	5,316.8	5,600.5
Marketable equity securities	1.1	1.6
Fair Value, Recurring [Member] | Level 2
Assets:
Foreign currency derivatives	0.3	0.6
Liabilities:
Foreign currency derivatives	0.1	0.3
Fair Value, Recurring [Member] | Level 3
Liabilities:
Contingent purchase price obligations	$ 167.1	$ 71.9