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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule of allowance for bad debt
The following table sets forth activities in our allowance for bad debt (in millions):
 
2019
 
2018
 
2017
Balance as of beginning of period
$
39.4

 
$
27.8

 
$
24.9

Charges to provision for bad debt
25.9

 
25.1

 
9.3

Write-off of uncollectible accounts receivable
(32.2
)
 
(16.2
)
 
(8.7
)
Recoveries of bad debt
2.4

 
2.9

 
2.0

Translation Adjustments
—

 
(0.1
)
 
0.3

Balance as of end of period
$
35.5

 
$
39.4

 
$
27.8