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Revenue (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disaggregation of Revenue [Line Items]      
Net sales $ 1,893.2 $ 1,589.1 $ 1,319.1
Increase (decrease) in accounts receivable 39.4 30.6 [1] 3.0 [1]
United States [Member]      
Disaggregation of Revenue [Line Items]      
Net sales 1,138.6 938.4 808.9
Iceland [Member]      
Disaggregation of Revenue [Line Items]      
Net sales $ 754.6 $ 650.7 $ 510.2
[1] As adjusted due to the adoption of ASU 2016-18 "Statement of Cash Flows (Topic 230) Restricted Cash."