Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Inventories - Summary of Inventories Value (Details)

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Note 6 - Inventories - Summary of Inventories Value (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Inventories $ 216.4 $ 218.2
Excess of market over reported value 95.9 78.3
Estimate of Fair Value Measurement [Member]    
Inventories $ 312.3 $ 296.5