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Supplemental Disclosures
 12 Months Ended
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Supplemental Disclosures
Supplemental Disclosures

Analysis of Allowances for Doubtful Accounts:
($ in millions)
 
For the Years Ended December 31,
 
2018
 
2017
 
2016
Allowance for Doubtful Accounts
 
 
 
 
 
Beginning balance
$
1.0

 
$
0.8

 
$
0.4

Bad debt expense
1.2

 
0.8

 
0.4

Recoveries
(0.2
)
 
—

 
—

Write-offs and discounts
(0.3
)
 
(0.6
)
 
—

Ending balance
$
1.7

 
$
1.0

 
$
0.8



Supplemental Cash Flow Information
($ in millions)
 
For the Years Ended December 31,
 
2018
 
2017
 
2016
Interest paid
$
24.0

 
$
22.7

 
$
13.3

Income taxes paid
23.2

 
38.1

 
31.9

Capital spending in accounts payable and accrued liabilities
5.0

 
7.7

 
8.8

Deferred contingent business acquisition consideration
—

 
8.6

 
—