Derivative Instruments and Hedging Activities (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Derivative, Collateral, Right to Reclaim Cash	$ 8.1
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, current	2.1	2.6
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Noncurrent	1.8	0
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, current	(32.0)	0
Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, noncurrent	(5.7)	0
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, current	1.2	0
Not Designated as Hedging Instrument [Member] \| Foreign Exchange Contract [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, current	0	(0.7)
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Derivative assets, current	1.5	2.3
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, current	(4.2)	(0.4)
Not Designated as Hedging Instrument [Member] \| Commodity Contract [Member] \| Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Derivative liabilities, noncurrent	$ 0	$ (0.1)

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.

+ References+ Details

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 after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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.

+ References+ Details

- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or 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 after one year or the normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References+ Details