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Fair Value Measurements, Level 3 Fair Value Input Reconciliation Table (Details) - Derivative - Midwest premium swap contracts
$ in Millions
3 Months Ended
Mar. 31, 2016
USD ($)
Reconciliation of activity for financial instruments classified as Level 3:  
Fair value measurement at December 31, 2015 $ 0.6
Total realized/unrealized (loss) included in:  
Cost of goods sold excluding depreciation and amortization and other items and Unrealized loss on derivative instruments 0.0
Transactions involving Level 3 derivative contracts:  
Purchases (0.1)
Sales 0.0
Issuances 0.0
Settlements (0.3)
Transactions involving Level 3 derivatives – net (0.4)
Transfers in and/or out of Level 3 valuation hierarchy 0.0
Fair value measurement at March 31, 2016 0.2
Total gain included in Unrealized (gain) loss on derivative instruments, attributable to the change in unrealized gain/loss relating to derivative contracts held at March 31, 2016: $ (0.1)