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Related Party Transactions (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
TOTALEnergies S.E.          
Related Party Transaction [Line Items]          
Proceeds from related party $ 1.6 $ 2.6 $ 3.1 $ 5.3  
Receivables from related party 0.4   0.4   $ 0.9
Related party expense 0.4 0.1 1.3 0.5  
SAFE&CEC S.r.l.          
Related Party Transaction [Line Items]          
Proceeds from related party 0.0 0.2 0.2 1.2  
Receivables from related party 0.0   0.0   0.2
Related party expense 3.3 $ 1.5 5.8 $ 4.3  
Payable to related parties $ 3.0   $ 3.0   $ 0.9