Financial Instruments and Risk Management (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Fair Value Measurements
Total current derivative contracts, assets	$ 26.7us-gaap_DerivativeAssetsCurrent	$ 9.4us-gaap_DerivativeAssetsCurrent
Total noncurrent derivative contracts, assets	13.3us-gaap_DerivativeAssetsNoncurrent	3.1us-gaap_DerivativeAssetsNoncurrent
Total current derivative contracts, liabilities	20.7us-gaap_DerivativeLiabilitiesCurrent	12.3us-gaap_DerivativeLiabilitiesCurrent
Total noncurrent derivative contracts, liabilities	23.9us-gaap_DerivativeLiabilitiesNoncurrent	7.6us-gaap_DerivativeLiabilitiesNoncurrent
Discount factor	12 month LIBOR
Commodity contracts
Fair Value Measurements
Total current derivative contracts, assets	9.7	5.1
Total noncurrent derivative contracts, assets	4.7	2.7
Total current derivative contracts, liabilities	12.2	8.5
Total noncurrent derivative contracts, liabilities	3.8	7.3
Foreign currency contracts
Fair Value Measurements
Total current derivative contracts, assets	16.5	4.3
Total noncurrent derivative contracts, assets	8.4
Total current derivative contracts, liabilities	8.1	2.9
Total noncurrent derivative contracts, liabilities	19.4
Interest rate and other contracts
Fair Value Measurements
Total current derivative contracts, assets	0.5
Total noncurrent derivative contracts, assets	0.2	0.4
Total current derivative contracts, liabilities	0.4	0.9
Total noncurrent derivative contracts, liabilities	0.7	0.3
Derivatives Designated As Hedging Instruments
Fair Value Measurements
Total current derivative contracts, assets	9.2	4.6
Total noncurrent derivative contracts, assets	4.2	2.6
Total current derivative contracts, liabilities	17.6	9.0
Total noncurrent derivative contracts, liabilities	3.6	7.1
Derivatives Designated As Hedging Instruments \| Commodity contracts
Fair Value Measurements
Total current derivative contracts, assets	8.1	3.8
Total noncurrent derivative contracts, assets	4.0	2.2
Total current derivative contracts, liabilities	9.6	6.9
Total noncurrent derivative contracts, liabilities	3.1	6.8
Derivatives Designated As Hedging Instruments \| Foreign currency contracts
Fair Value Measurements
Total current derivative contracts, assets	1.1	0.8
Total current derivative contracts, liabilities	7.6	1.6
Derivatives Designated As Hedging Instruments \| Interest rate and other contracts
Fair Value Measurements
Total noncurrent derivative contracts, assets	0.2	0.4
Total current derivative contracts, liabilities	0.4	0.5
Total noncurrent derivative contracts, liabilities	0.5	0.3
Derivatives Not Designated As Hedging Instruments
Fair Value Measurements
Total current derivative contracts, assets	17.5	4.8
Total noncurrent derivative contracts, assets	9.1	0.5
Total current derivative contracts, liabilities	3.1	3.3
Total noncurrent derivative contracts, liabilities	20.3	0.5
Derivatives Not Designated As Hedging Instruments \| Commodity contracts
Fair Value Measurements
Total current derivative contracts, assets	1.6	1.3
Total noncurrent derivative contracts, assets	0.7	0.5
Total current derivative contracts, liabilities	2.6	1.6
Total noncurrent derivative contracts, liabilities	0.7	0.5
Derivatives Not Designated As Hedging Instruments \| Foreign currency contracts
Fair Value Measurements
Total current derivative contracts, assets	15.4	3.5
Total noncurrent derivative contracts, assets	8.4
Total current derivative contracts, liabilities	0.5	1.3
Total noncurrent derivative contracts, liabilities	19.4
Derivatives Not Designated As Hedging Instruments \| Interest rate and other contracts
Fair Value Measurements
Total current derivative contracts, assets	0.5
Total current derivative contracts, liabilities		0.4
Total noncurrent derivative contracts, liabilities	$ 0.2

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