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Accounts Receivable (Tables)
12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Schedule of allowance for bad debt
The following table sets forth activities in our allowance for credit losses (in millions):
202020192018
Balance as of beginning of period*$46.6 $39.4 $27.8 
Charges to provision for credit losses63.7 25.9 25.1 
Write-off of uncollectible receivables(53.7)(32.2)(16.2)
Recoveries of credit losses1.0 2.4 2.9 
Translation adjustments(0.3)— (0.1)
Balance as of end of period$57.3 $35.5 $39.4 

* For 2020, the balance as of the beginning of the period includes the $11.1 million cumulative transition adjustment related to the implementation of ASU 2016-13.