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Fair Value
6 Months Ended
Jun. 30, 2020
Fair Value [Abstract]  
Fair Value Fair Value
Financial assets and liabilities measured at fair value on a recurring basis were (in millions):
June 30, 2020
Level 1Level 2Level 3Total
Assets:    
Cash and cash equivalents$3,281.0   $3,281.0  
Short-term investments—   —  
Marketable equity investments1.6  1.6  
Foreign currency derivatives$0.5  0.5  
Liabilities:   
Foreign currency derivative$0.8  $0.8  
Contingent purchase price obligations$104.3  104.3  

December 31, 2019
Level 1Level 2Level 3Total
Assets:    
Cash and cash equivalents$4,305.7   $4,305.7  
Short-term investments3.6   3.6  
Marketable equity investments1.6   1.6  
Foreign currency derivative instruments$0.6  0.6  
Liabilities:
Foreign currency derivatives0.4  0.4  
Contingent purchase price obligations$107.7  107.7  

Changes in contingent purchase price obligations were (in millions):
Six Months Ended June 30,
20202019
January 1$107.7  $146.5  
Acquisitions10.0  1.8  
Revaluation and interest1.6  1.5  
Payments(12.8) (28.9) 
Foreign currency translation(2.2) (0.2) 
June 30
$104.3  $120.7  
The carrying amount and fair value of our financial assets and liabilities were (in millions):
 June 30, 2020December 31, 2019
Carrying
Amount
Fair
Value
Carrying
Amount
Fair
Value
Assets:    
Cash and cash equivalents$3,281.0  $3,281.0  $4,305.7  $4,305.7  
Short-term investments—  —  3.6  3.6  
Marketable equity securities1.6  1.6  1.6  1.6  
Non-marketable equity securities8.7  8.7  9.0  9.0  
Foreign currency derivatives0.5  0.5  0.6  0.6  
Liabilities:    
Short-term debt$6.4  $6.4  $10.1  $10.1  
Foreign currency derivatives0.8  0.8  0.4  0.4  
Contingent purchase price obligations104.3  104.3  107.7  107.7  
Long-term debt, including current portion5,714.1  6,122.6  5,134.3  5,316.4  
The estimated fair value of the foreign currency derivatives is determined using model-derived valuations, taking into consideration foreign currency rates and counterparty credit risk. The estimated fair value of the contingent purchase price obligations is calculated in accordance with the terms of each acquisition agreement and is discounted. The fair value of debt is based on quoted market prices.