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Changes in Level 3 Commodity Derivatives (Details) - Commodity Contract - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning Balance $ (17.1) $ 0.2 $ (12.7) $ 0.1
Settlements 0.5 (0.5) (0.6) (1.4)
(Losses) gains recognized in earnings [1] (21.7) 0.5 (25.0) 1.5
Ending Balance (38.3) 0.2 (38.3) 0.2
Transfers Level 3, Net $ 0.0 $ 0.0 $ 0.0 $ 0.0
[1] Amounts relate to commodity derivatives held at the end of the period.