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Business Segments - Geography, Segment Reporting (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Sales $ 1,605.1 $ 1,836.6 $ 1,893.2
United States [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Sales 1,007.5 1,179.6 1,138.6
Long-lived assets 363.3 419.1 396.0
Iceland [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Net Sales 597.6 657.0 754.6
Long-lived assets 511.8 518.0 554.3
Other [Member]      
Revenues from External Customers and Long-Lived Assets [Line Items]      
Long-lived assets $ 68.6 $ 75.3 $ 76.5