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Valuation and Qualifying Accounts and Reserves (Schedule II)
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts and Reserves (Schedule II) Financial Statement Schedule
Schedule II — Valuation and Qualifying Accounts and Reserves for the years ended December 31, 2019, 2018 and 2017 is set forth below. All other schedules for which provision is made in the applicable accounting regulations of the Securities and Exchange Commission are not required under the related instructions or are inapplicable and therefore have been omitted.
Valuation and Qualifying Accounts and Reserves
(Schedule II)
Changes in the allowance for doubtful accounts were as follows: 
(millions of dollars)
2019
 
2018
 
2017
Beginning balance
$
45.9

 
$
53.0

 
$
40.5

Bad debt expense
53.1

 
38.2

 
42.7

Uncollectible accounts written off, net of recoveries
(62.5
)
 
(45.3
)
 
(30.2
)
Ending balance
$
36.5

 
$
45.9

 
$
53.0



Changes in deferred tax asset valuation allowances were as follows:
(millions of dollars)
2019
 
2018
 
2017
Beginning balance
$
73.5

 
$
44.1

 
$
17.3

Additions (deductions) (1)
7.4

 
10.6

 
(0.5
)
Acquired balances
3.7

 
18.8

 
27.3

Ending balance
$
84.6

 
$
73.5

 
$
44.1


(1) Additions (deductions) did not have a material impact on the Income Statement in 2019, 2018 or 2017.