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Restructuring Activities - Rollforward (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Restructuring Reserve        
Beginning balance, restructuring accrual $ 1.9 $ 1.6 $ 0.9 $ 2.7
Restructuring costs 4.4 0.6 11.8 1.5
Property, plant and equipment impairment and disposals (0.7)   (5.6)  
Cash payments and other (4.3) (1.9) (5.8) (3.9)
Ending balance, restructuring accrual 1.3 0.3 1.3 0.3
Operating Segments | Energy & Chemicals        
Restructuring Reserve        
Beginning balance, restructuring accrual 0.7 0.2 0.0 0.2
Restructuring costs (1.1) 0.2 3.4 0.4
Property, plant and equipment impairment and disposals 1.6   (1.6)  
Cash payments and other (0.6) (0.4) (1.2) (0.6)
Ending balance, restructuring accrual 0.6 0.0 0.6 0.0
Operating Segments | D&S West        
Restructuring Reserve        
Beginning balance, restructuring accrual 0.3 0.0 0.0 1.2
Restructuring costs 0.1 0.0 0.4 0.0
Property, plant and equipment impairment and disposals 0.0   0.0  
Cash payments and other (0.4) 0.2 (0.4) (1.0)
Ending balance, restructuring accrual 0.0 0.2 0.0 0.2
Operating Segments | D&S East        
Restructuring Reserve        
Beginning balance, restructuring accrual 0.8 0.0 0.8 0.2
Restructuring costs 5.4 0.3 7.8 0.5
Property, plant and equipment impairment and disposals (2.3)   (4.0)  
Cash payments and other (3.2) (0.2) (3.9) (0.6)
Ending balance, restructuring accrual 0.7 0.1 0.7 0.1
Corporate        
Restructuring Reserve        
Beginning balance, restructuring accrual 0.1 1.4 0.1 1.1
Restructuring costs 0.0 0.1 0.2 0.6
Property, plant and equipment impairment and disposals 0.0   0.0  
Cash payments and other (0.1) (1.5) (0.3) (1.7)
Ending balance, restructuring accrual $ 0.0 $ 0.0 $ 0.0 $ 0.0