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Business Segments - Geography, Segment Reporting (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Sales $ 2,212.5 $ 1,605.1 $ 1,836.6
United States      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Sales 1,413.0 1,007.5 1,179.6
Long-lived assets 400.1 363.3 419.1
Iceland      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Sales 799.5 597.6 657.0
Long-lived assets 490.1 511.8 518.0
Other      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 61.5 $ 68.6 $ 75.3