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Accounts and Notes Receivable, Net
12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Accounts and Notes Receivable, Net ACCOUNTS AND NOTES RECEIVABLE, NET
 
 
Year Ended December 31,
 
 
2018
 
2017
Accounts receivable—trade, net (1)
 
$
739.9

 
$
748.2

Notes receivable
 
36.1

 
29.4

Other
 
84.8

 
92.6

Total
 
$
860.8

 
$
870.2

(1) Allowance for doubtful accounts was $15.4 million and $15.9 million at December 31, 2018 and 2017, respectively.
Bad debt expense of $2.3 million, $3.5 million and $3.4 million was included within selling, general and administrative expenses for the years ended December 31, 2018, 2017 and 2016, respectively.