Derivatives (Assets Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Derivatives
Fair value of derivative assets - current	$ 1.3	$ 16.8
Fair value of derivative liabilities - current	(7.6)	(2.9)
Fair value of derivative liabilities - long term		(0.1)
Commodity Swap
Derivatives
Fair value of derivative assets - current	1.3	16.8
Fair value of derivative liabilities - current	(7.6)	(2.9)
Fair value of derivative liabilities - long term		(0.1)
Net fair value of derivatives	$ (6.3)	$ 13.8

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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