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Restructuring Activities - Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Restructuring Reserve        
Beginning balance, restructuring accrual $ 0.2 $ 2.0 $ 2.7 $ 6.3
Restructuring costs 2.0 2.3 3.5 8.5
Cash payments and other (0.2) (2.6) (3.5) (13.1)
Change in estimates     (0.7)  
Ending balance, restructuring accrual 2.0 1.7 2.0 1.7
Operating Segments | Energy & Chemicals        
Restructuring Reserve        
Beginning balance, restructuring accrual 0.0 0.0 0.2 0.1
Restructuring costs 0.1 0.2 0.5 2.3
Cash payments and other (0.1) 0.0 (0.7) (2.2)
Change in estimates     0.0  
Ending balance, restructuring accrual 0.0 0.2 0.0 0.2
Operating Segments | D&S West        
Restructuring Reserve        
Beginning balance, restructuring accrual 0.2 0.5 1.2 3.2
Restructuring costs 0.0 0.2 0.0 0.9
Cash payments and other (0.1) (0.6) (0.4) (4.0)
Change in estimates     (0.7)  
Ending balance, restructuring accrual 0.1 0.1 0.1 0.1
Operating Segments | D&S East        
Restructuring Reserve        
Beginning balance, restructuring accrual 0.0 0.0 0.2 0.0
Restructuring costs 0.1 0.5 0.6 0.8
Cash payments and other 0.0 (0.5) (0.7) (0.8)
Change in estimates     0.0  
Ending balance, restructuring accrual 0.1 0.0 0.1 0.0
Corporate        
Restructuring Reserve        
Beginning balance, restructuring accrual 0.0 1.5 1.1 3.0
Restructuring costs 1.8 1.4 2.4 4.5
Cash payments and other 0.0 (1.5) (1.7) (6.1)
Change in estimates     0.0  
Ending balance, restructuring accrual $ 1.8 $ 1.4 $ 1.8 $ 1.4