Business Segments - Geography, Segment Reporting (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	$ 2,777.3	$ 2,212.5	$ 1,605.1
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	1,737.2	1,413.0	1,007.5
Long-lived assets	244.9	400.1	363.3
Iceland
Revenues from External Customers and Long-Lived Assets [Line Items]
Net Sales	1,040.1	799.5	597.6
Long-lived assets	491.0	490.1	511.8
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Long-lived assets	$ 58.3	$ 61.5	$ 68.6