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Business Combinations (Tables)
3 Months Ended
Mar. 31, 2021
Business Combinations [Abstract]  
Summary of Changes in Contingent Consideration Measured at Fair Value on a Recurring Basis Changes in contingent consideration measured at fair value on a recurring basis were as follows (in millions):
 
   
Three Months Ended
March 31,
 
   
2021
   
2020
 
Opening balance
  $39.8   $16.4 
Acquisitions
   2.0    —   
Payments and issuances
   (10.6   —   
Fair value (gains) losses included in net loss
   (3.2   0.7 
   
 
 
   
 
 
 
Closing Balance
  $28.0   $17.1