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Supplementary Data Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts (Tables)
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts [Abstract]  
Valuation and Qualifying Accounts - Allowance for Uncollectible Accounts Receivable
Valuation and Qualifying Accounts – Allowance for Uncollectible Accounts Receivable
 
Years ended December 31,
 
2017
 
2016
 
2015
Balance at beginning of period
$
55.7

 
$
54.2

 
$
59.5

Charges to costs and expenses
9.5

 
16.7

 
11.4

Deductions:
 
 
 
 
 
Dispositions
(1.0
)
 
(2.5
)
 
(2.8
)
Uncollectible accounts written off
(25.5
)
 
(9.4
)
 
(9.8
)
Foreign currency translation adjustments
4.0

 
(3.3
)
 
(4.1
)
Balance at end of period
$
42.7

 
$
55.7

 
$
54.2