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Revenue - Energy Segment Disaggregation of Revenue (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 439.9 $ 455.0 $ 844.8 $ 870.5
Net revenue 518.6 496.8 1,010.0 950.5
Operating Segments        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 439.9 455.0 844.8 870.5
Operating Segments | Energy        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers   7.1   11.6
RNG incentives 0.1 0.4 0.4 0.7
Alternative fuel tax credit 0.0 2.6 0.0 2.6
Other revenue 0.1 0.1 0.1 0.1
Net revenue 5.5 7.1 10.6 11.6
Operating Segments | Energy | Volume-related        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 5.3 4.0 10.1 8.1
Operating Segments | Energy | Maintenance services        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers 0.0 0.0 0.0 0.1
Operating Segments | Energy | Volume-Related And Maintenance [Member]        
Segment Reporting Information [Line Items]        
Total revenue from contracts with customers $ 5.3 $ 4.0 $ 10.1 $ 8.2