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Restructuring Activities (Tables)
 9 Months Ended
Sep. 30, 2018
Restructuring and Related Activities [Abstract]  
Summary of Severance and Other Restructuring Costs
The following table is a summary of the severance and other restructuring costs, which included employee-related costs, facility rent and exit costs, relocation, recruiting, travel and other, for the three and nine months ended September 30, 2018 and 2017:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
Severance:
 
 
 
 
 
 
 
Cost of sales
$
—

 
$
—

 
$
0.2

 
$
0.4

Selling, general, and administrative expenses
1.9

 
0.8

 
2.6

 
2.3

Total severance costs
1.9

 
0.8

 
2.8

 
2.7

Other restructuring:
 
 
 
 
 
 
 
Cost of sales
—

 
0.3

 
0.5

 
1.9

Selling, general, and administrative expenses
0.1

 
1.2

 
0.2

 
3.9

Total other restructuring costs
0.1

 
1.5

 
0.7

 
5.8

 
 
 
 
 
 
 
 
Total restructuring costs
$
2.0

 
$
2.3

 
$
3.5

 
$
8.5
Rollforward of Restructuring Cost
The following tables summarize our restructuring activities for the three and nine months ended September 30, 2018 and 2017:
    
 
Three Months Ended September 30, 2018
 
Energy & Chemicals
 
D&S West
 
D&S East
 
Corporate
 
Consolidated
Balance as of June 30, 2018
$
—

 
$
0.2

 
$
—

 
$
—

 
$
0.2

Restructuring costs
0.1

 
—

 
0.1

 
1.8

 
2.0

Cash payments
(0.1
)
 
(0.1
)
 
—

 
—

 
(0.2
)
Balance as of September 30, 2018
$
—

 
$
0.1

 
$
0.1

 
$
1.8

 
$
2.0

 
Three Months Ended September 30, 2017
 
Energy & Chemicals
 
D&S West
 
D&S East
 
Corporate
 
Consolidated
Balance as of June 30, 2017
$
—

 
$
0.5

 
$
—

 
$
1.5

 
$
2.0

Restructuring costs
0.2

 
0.2

 
0.5

 
1.4

 
2.3

Cash payments
—

 
(0.6
)
 
(0.5
)
 
(1.5
)
 
(2.6
)
Balance as of September 30, 2017
$
0.2

 
$
0.1

 
$
—

 
$
1.4

 
$
1.7

 
Nine Months Ended September 30, 2018
 
Energy & Chemicals
 
D&S West
 
D&S East
 
Corporate
 
Consolidated
Balance as of December 31, 2017
$
0.2

 
$
1.2

 
$
0.2

 
$
1.1

 
$
2.7

Restructuring costs
0.5

 
—

 
0.6

 
2.4

 
3.5

Cash payments
(0.7
)
 
(0.4
)
 
(0.7
)
 
(1.7
)
 
(3.5
)
Change in estimates
—

 
(0.7
)
 
—

 
—

 
(0.7
)
Balance as of September 30, 2018
$
—

 
$
0.1

 
$
0.1

 
$
1.8

 
$
2.0

 
Nine Months Ended September 30, 2017
 
Energy & Chemicals
 
D&S West
 
D&S East
 
Corporate
 
Consolidated
Balance as of December 31, 2016
$
0.1

 
$
3.2

 
$
—

 
$
3.0

 
$
6.3

Restructuring charges
2.3

 
0.9

 
0.8

 
4.5

 
8.5

Cash payments and other
(2.2
)
 
(4.0
)
 
(0.8
)
 
(6.1
)
 
(13.1
)
Balance as of September 30, 2017
$
0.2

 
$
0.1

 
$
—

 
$
1.4

 
$
1.7