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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
Disaggregation of Revenue [Line Items]        
Revenue $ 581.4 $ 392.9 $ 1,553.4 $ 1,216.0
United States [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 373.8 242.0 997.9 764.0
Iceland [Member]        
Disaggregation of Revenue [Line Items]        
Revenue $ 207.6 $ 150.9 $ 555.5 $ 452.0