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Fair Value (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Assets:      
Cash and cash equivalents $ 2,568.1   $ 3,796.0
Short-term investments 1.9   0.4
Investment in equity securities 1.6   1.4
Foreign currency derivative instruments 0.8   1.0
Investment in equity securities without readily determinable fair value 15.6   14.4
Liabilities:      
Short-term debt 8.6   11.8
Interest rate and foreign currency derivative instruments 63.5   39.5
Contingent purchase price obligations 281.7   215.6
Long-term debt, including current portion 4,916.1   5,056.9
Carrying Amount      
Assets:      
Cash and cash equivalents 2,568.1   3,796.0
Short-term investments 1.9   0.4
Investment in equity securities 1.6   1.4
Foreign currency derivative instruments 0.8   1.0
Investment in equity securities without readily determinable fair value 15.6   14.4
Liabilities:      
Short-term debt 8.6   11.8
Interest rate and foreign currency derivative instruments 63.5   39.5
Contingent purchase price obligations 281.7   215.6
Long-term debt, including current portion 4,885.0   4,912.9
Contingent purchase price obligations      
Changes in Contingent Purchase Price Obligations [Roll Forward]      
January 1 215.6 $ 386.1  
Acquisitions 68.1 15.5  
Revaluation and interest 1.1 (0.9)  
Payments (5.2) (2.1)  
Foreign currency translation 2.1 8.0  
March 31 281.7 $ 406.6  
Fair Value, Measurements, Recurring [Member]      
Assets:      
Cash and cash equivalents 2,568.1   3,796.0
Short-term investments 1.9   0.4
Investment in equity securities 1.6   1.4
Foreign currency derivative instruments 0.8   1.0
Liabilities:      
Interest rate and foreign currency derivative instruments 63.5   39.5
Contingent purchase price obligations 281.7   215.6
Fair Value, Measurements, Recurring [Member] | Level 1      
Assets:      
Cash and cash equivalents 2,568.1   3,796.0
Short-term investments 1.9   0.4
Investment in equity securities 1.6   1.4
Fair Value, Measurements, Recurring [Member] | Level 2      
Assets:      
Foreign currency derivative instruments 0.8   1.0
Liabilities:      
Interest rate and foreign currency derivative instruments 63.5   39.5
Fair Value, Measurements, Recurring [Member] | Level 3      
Liabilities:      
Contingent purchase price obligations $ 281.7   $ 215.6