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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers $ 277.4 $ 285.7 $ 801.1 $ 755.1  
Performance obligation 0.0   0.0   $ 0.0
United States          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers 260.9 270.3 748.0 711.6  
Canada          
Disaggregation of Revenue [Line Items]          
Revenue from contracts with customers $ 16.5 $ 15.4 $ 53.1 $ 43.5