Quarterly report pursuant to Section 13 or 15(d)

Note 12 - Derivative Contracts - Effects of Derivative Contracts in Condensed Consolidated Financial Statements (Details)

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Note 12 - Derivative Contracts - Effects of Derivative Contracts in Condensed Consolidated Financial Statements (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Gross Amounts of Recognized Assets $ 3.3   $ 3.5
Gross Amounts Offset in Consolidated Balance Sheet (1.4)   (3.5)
Net Amounts of Assets Presented in Consolidated Balance Sheet 1.9  
Derivative contract assets 1.9  
Gross Amounts of Recognized Liabilities 5.0   6.5
Gross Amounts Offset in Consolidated Balance Sheet (1.4)   (3.5)
Net Amounts of Liabilities Presented in Consolidated Balance Sheet 3.6   3.0
Derivative conctract liabilities, noncurrent 3.6   2.1
Derivative contract liabilities   0.9
Total commodity derivative contract (gains) losses in cost of sales (3.0) $ 1.9  
Commodity Contract [Member]      
Gross Amounts of Recognized Assets 3.0   3.3
Gross Amounts Offset in Consolidated Balance Sheet (1.2)   (3.3)
Net Amounts of Assets Presented in Consolidated Balance Sheet 1.8  
Gross Amounts of Recognized Liabilities 1.2   4.2
Gross Amounts Offset in Consolidated Balance Sheet (1.2)   (3.4)
Net Amounts of Liabilities Presented in Consolidated Balance Sheet   0.8
Total commodity derivative contract (gains) losses in cost of sales (2.8) 1.9  
Interest Rate Swap [Member]      
Gross Amounts of Recognized Liabilities 3.6   2.0
Gross Amounts Offset in Consolidated Balance Sheet  
Net Amounts of Liabilities Presented in Consolidated Balance Sheet 3.6   2.0
Total commodity derivative contract (gains) losses in cost of sales (1.6)  
Energy Related Derivative [Member]      
Gross Amounts of Recognized Assets 0.2   0.1
Gross Amounts Offset in Consolidated Balance Sheet (0.2)   (0.1)
Net Amounts of Assets Presented in Consolidated Balance Sheet  
Gross Amounts of Recognized Liabilities 0.2   0.3
Gross Amounts Offset in Consolidated Balance Sheet (0.2)   (0.1)
Net Amounts of Liabilities Presented in Consolidated Balance Sheet   0.2
Total commodity derivative contract (gains) losses in cost of sales (0.2)  
Collateral on Deposit [Member]      
Gross Amounts of Recognized Assets 0.1   0.1
Gross Amounts Offset in Consolidated Balance Sheet   (0.1)
Net Amounts of Assets Presented in Consolidated Balance Sheet $ 0.1