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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2017
Accounts Receivable, Net [Abstract]  
Schedule of allowance for bad debt The following table sets forth activities in our allowance for bad debt (in millions):
 
2017
 
2016
 
2015
Balance as of beginning of period
$
24.9

 
$
25.0

 
$
25.7

Charges to provision for bad debt
9.3

 
15.4

 
7.5

Write-off of uncollectible accounts receivable
(8.7
)
 
(15.9
)
 
(8.3
)
Recoveries of bad debt
2.0

 
0.3

 
0.5

Translation Adjustments
0.3

 
0.2

 
(0.4
)
Balance as of end of period
$
27.8

 
$
24.9

 
$
25.0