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

 
2015

 
2014

Balance as of beginning of period
$
25.0

 
$
25.7

 
$
29.2

Charges to provision for bad debt
15.4

 
7.5

 
3.8

Write-off of uncollectible accounts receivable
(15.9
)
 
(8.3
)
 
(8.0
)
Recoveries of bad debt
0.3

 
0.5

 
0.8

Translation Adjustments
0.2

 
(0.4
)
 
—

Balance as of end of period
$
24.9

 
$
25.0

 
$
25.7