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Revenue (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disaggregation of Revenue [Line Items]        
Revenue $ 528.0 $ 401.9 $ 972.0 $ 823.1
United States [Member]        
Disaggregation of Revenue [Line Items]        
Revenue 347.9 247.9 624.1 522.0
Iceland [Member]        
Disaggregation of Revenue [Line Items]        
Revenue $ 180.1 $ 154.0 $ 347.9 $ 301.1