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ACCOUNTS RECEIVABLE, NET
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
ACCOUNTS RECEIVABLE, NET
ACCOUNTS RECEIVABLE, NET
 
December 31, 2017
 
December 31,
2016
Gross accounts receivable
$
1,742.2

 
$
1,564.3

Less allowance for doubtful accounts
(260.9
)
 
(235.6
)
 
$
1,481.3

 
$
1,328.7


Bad debt expense was $314.7, $287.3 and $265.4 in 2017, 2016 and 2015 respectively.