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Derivatives (Details) - 9 months ended Sep. 30, 2015 € in Millions, £ in Millions, bbl in Millions, ZAR in Millions, SGD in Millions, RON in Millions, NOK in Millions, MXN in Millions, CLP in Millions, CAD in Millions, AUD in Millions, $ in Millions	ZAR $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD bbl	SGD $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	RON $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	NOK $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	MXN $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	GBP (£) $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	EUR (€) $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	CLP $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	CAD $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	AUD $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD	USD ($) $ / bbl $ / ZAR $ / SGD $ / RON $ / NOK $ / MXN $ / £ $ / € $ / CLP $ / CAD $ / AUD
Derivatives designated as hedging instruments | Cash flow hedges.
Derivative instruments, at their respective fair value positions
Fair Value Amount											$ (1.6)
Derivatives designated as hedging instruments | Cash flow hedges. | Commodity contracts | 2015
Derivative instruments, at their respective fair value positions
Weighted Average Fixed Price | $ / bbl	64.730	64.730	64.730	64.730	64.730	64.730	64.730	64.730	64.730	64.730	64.730
Fair Value Amount											$ 0.5
Derivatives designated as hedging instruments | Cash flow hedges. | Commodity contracts | 2016
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	1.5
Weighted Average Fixed Price | $ / bbl	66.772	66.772	66.772	66.772	66.772	66.772	66.772	66.772	66.772	66.772	66.772
Weighted Average Mark-to-Market | $ / bbl	(1.400)	(1.400)	(1.400)	(1.400)	(1.400)	(1.400)	(1.400)	(1.400)	(1.400)	(1.400)	(1.400)
Fair Value Amount											$ (2.1)
Derivatives designated as hedging instruments | Fair value hedges
Derivative instruments, at their respective fair value positions
Fair Value Amount											$ 0.5
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | 2015
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	5.8
Weighted Average Fixed Price | $ / bbl	42.959	42.959	42.959	42.959	42.959	42.959	42.959	42.959	42.959	42.959	42.959
Weighted Average Mark-to-Market | $ / bbl	(0.224)	(0.224)	(0.224)	(0.224)	(0.224)	(0.224)	(0.224)	(0.224)	(0.224)	(0.224)	(0.224)
Fair Value Amount											$ (1.3)
Derivatives designated as hedging instruments | Fair value hedges | Commodity contracts | 2016
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	0.1
Weighted Average Fixed Price | $ / bbl	66.989	66.989	66.989	66.989	66.989	66.989	66.989	66.989	66.989	66.989	66.989
Weighted Average Mark-to-Market | $ / bbl	18.000	18.000	18.000	18.000	18.000	18.000	18.000	18.000	18.000	18.000	18.000
Fair Value Amount											$ 1.8
Derivatives not designated as hedging instruments
Derivative instruments, at their respective fair value positions
Fair Value Amount											$ 11.1
Derivatives not designated as hedging instruments | Commodity contracts | Long | 2015
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	21.3
Weighted Average Fixed Price | $ / bbl	51.090	51.090	51.090	51.090	51.090	51.090	51.090	51.090	51.090	51.090	51.090
Weighted Average Mark-to-Market | $ / bbl	(13.649)	(13.649)	(13.649)	(13.649)	(13.649)	(13.649)	(13.649)	(13.649)	(13.649)	(13.649)	(13.649)
Fair Value Amount											$ (291.3)
Derivatives not designated as hedging instruments | Commodity contracts | Long | 2016
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	23.2
Weighted Average Fixed Price | $ / bbl	62.660	62.660	62.660	62.660	62.660	62.660	62.660	62.660	62.660	62.660	62.660
Weighted Average Mark-to-Market | $ / bbl	(22.101)	(22.101)	(22.101)	(22.101)	(22.101)	(22.101)	(22.101)	(22.101)	(22.101)	(22.101)	(22.101)
Fair Value Amount											$ (513.6)
Derivatives not designated as hedging instruments | Commodity contracts | Long | 2017
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	0.9
Weighted Average Fixed Price | $ / bbl	26.260	26.260	26.260	26.260	26.260	26.260	26.260	26.260	26.260	26.260	26.260
Weighted Average Mark-to-Market | $ / bbl	(2.065)	(2.065)	(2.065)	(2.065)	(2.065)	(2.065)	(2.065)	(2.065)	(2.065)	(2.065)	(2.065)
Fair Value Amount											$ (1.9)
Derivatives not designated as hedging instruments | Commodity contracts | Long | 2018
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	0.1
Weighted Average Fixed Price | $ / bbl	17.500	17.500	17.500	17.500	17.500	17.500	17.500	17.500	17.500	17.500	17.500
Weighted Average Mark-to-Market | $ / bbl	(1.572)	(1.572)	(1.572)	(1.572)	(1.572)	(1.572)	(1.572)	(1.572)	(1.572)	(1.572)	(1.572)
Fair Value Amount											$ (0.1)
Derivatives not designated as hedging instruments | Commodity contracts | Short | 2015
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	21.1
Weighted Average Fixed Price | $ / bbl	58.480	58.480	58.480	58.480	58.480	58.480	58.480	58.480	58.480	58.480	58.480
Weighted Average Mark-to-Market | $ / bbl	14.600	14.600	14.600	14.600	14.600	14.600	14.600	14.600	14.600	14.600	14.600
Fair Value Amount											$ 308.3
Derivatives not designated as hedging instruments | Commodity contracts | Short | 2016
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	21.6
Weighted Average Fixed Price | $ / bbl	69.870	69.870	69.870	69.870	69.870	69.870	69.870	69.870	69.870	69.870	69.870
Weighted Average Mark-to-Market | $ / bbl	23.284	23.284	23.284	23.284	23.284	23.284	23.284	23.284	23.284	23.284	23.284
Fair Value Amount											$ 502.8
Derivatives not designated as hedging instruments | Commodity contracts | Short | 2017
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	1.0
Weighted Average Fixed Price | $ / bbl	20.160	20.160	20.160	20.160	20.160	20.160	20.160	20.160	20.160	20.160	20.160
Weighted Average Mark-to-Market | $ / bbl	2.129	2.129	2.129	2.129	2.129	2.129	2.129	2.129	2.129	2.129	2.129
Fair Value Amount											$ 2.1
Derivatives not designated as hedging instruments | Commodity contracts | Short | 2018
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	0.1
Weighted Average Fixed Price | $ / bbl	26.810	26.810	26.810	26.810	26.810	26.810	26.810	26.810	26.810	26.810	26.810
Weighted Average Mark-to-Market | $ / bbl	4.505	4.505	4.505	4.505	4.505	4.505	4.505	4.505	4.505	4.505	4.505
Fair Value Amount											$ 0.5
Derivatives not designated as hedging instruments | Commodity contracts | Short | 2020
Derivative instruments, at their respective fair value positions
Notional value of commodity contracts | bbl	0.1
Weighted Average Fixed Price | $ / bbl	18.840	18.840	18.840	18.840	18.840	18.840	18.840	18.840	18.840	18.840	18.840
Weighted Average Mark-to-Market | $ / bbl	3.895	3.895	3.895	3.895	3.895	3.895	3.895	3.895	3.895	3.895	3.895
Fair Value Amount											$ 0.4
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | AUD | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | AUD										AUD 8.9
Weighted Average Fixed Price | $ / AUD	0.732	0.732	0.732	0.732	0.732	0.732	0.732	0.732	0.732	0.732	0.732
Weighted Average Mark-to-Market | $ / AUD	0.034	0.034	0.034	0.034	0.034	0.034	0.034	0.034	0.034	0.034	0.034
Fair Value Amount											$ 0.3
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | CAD | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | CAD									CAD 81.3
Weighted Average Fixed Price | $ / CAD	1.307	1.307	1.307	1.307	1.307	1.307	1.307	1.307	1.307	1.307	1.307
Weighted Average Mark-to-Market | $ / CAD	0.009	0.009	0.009	0.009	0.009	0.009	0.009	0.009	0.009	0.009	0.009
Fair Value Amount											$ 0.7
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | CLP | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | CLP								CLP 2,841.4
Weighted Average Fixed Price | $ / CLP	677.060	677.060	677.060	677.060	677.060	677.060	677.060	677.060	677.060	677.060	677.060
Weighted Average Mark-to-Market | $ / CLP	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000
Fair Value Amount											$ 0.2
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | EUR | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | €							€ 52.5
Weighted Average Fixed Price | $ / €	1.118	1.118	1.118	1.118	1.118	1.118	1.118	1.118	1.118	1.118	1.118
Weighted Average Mark-to-Market | $ / €	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)	(0.006)
Fair Value Amount											$ (0.3)
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | GBP | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | £						£ 116.3
Weighted Average Fixed Price | $ / £	1.552	1.552	1.552	1.552	1.552	1.552	1.552	1.552	1.552	1.552	1.552
Weighted Average Mark-to-Market | $ / £	0.008	0.008	0.008	0.008	0.008	0.008	0.008	0.008	0.008	0.008	0.008
Fair Value Amount											$ 0.9
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | MXN | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | MXN					MXN 2,126.1
Weighted Average Fixed Price | $ / MXN	16.478	16.478	16.478	16.478	16.478	16.478	16.478	16.478	16.478	16.478	16.478
Weighted Average Mark-to-Market | $ / MXN	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000
Fair Value Amount											$ (0.3)
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | NOK | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | NOK				NOK 43.8
Weighted Average Fixed Price | $ / NOK	8.219	8.219	8.219	8.219	8.219	8.219	8.219	8.219	8.219	8.219	8.219
Weighted Average Mark-to-Market | $ / NOK	0.002	0.002	0.002	0.002	0.002	0.002	0.002	0.002	0.002	0.002	0.002
Fair Value Amount											$ 0.1
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | RON | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | RON			RON 41.0
Weighted Average Fixed Price | $ / RON	3.999	3.999	3.999	3.999	3.999	3.999	3.999	3.999	3.999	3.999	3.999
Weighted Average Mark-to-Market | $ / RON	(0.002)	(0.002)	(0.002)	(0.002)	(0.002)	(0.002)	(0.002)	(0.002)	(0.002)	(0.002)	(0.002)
Fair Value Amount											$ (0.1)
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | SGD | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | SGD		SGD 37.4
Weighted Average Fixed Price | $ / SGD	1.392	1.392	1.392	1.392	1.392	1.392	1.392	1.392	1.392	1.392	1.392
Weighted Average Mark-to-Market | $ / SGD	0.011	0.011	0.011	0.011	0.011	0.011	0.011	0.011	0.011	0.011	0.011
Fair Value Amount											$ 0.4
Derivatives not designated as hedging instruments | Foreign currency contracts | 2015 | ZAR | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | ZAR	ZAR 59.1
Weighted Average Fixed Price | $ / ZAR	13.019	13.019	13.019	13.019	13.019	13.019	13.019	13.019	13.019	13.019	13.019
Weighted Average Mark-to-Market | $ / ZAR	0.007	0.007	0.007	0.007	0.007	0.007	0.007	0.007	0.007	0.007	0.007
Fair Value Amount											$ 0.4
Derivatives not designated as hedging instruments | Foreign currency contracts | 2016 | GBP | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | £						£ 40.0
Weighted Average Fixed Price | $ / £	1.553	1.553	1.553	1.553	1.553	1.553	1.553	1.553	1.553	1.553	1.553
Weighted Average Mark-to-Market | $ / £	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035	0.035
Fair Value Amount											$ 1.4
Derivatives not designated as hedging instruments | Foreign currency contracts | 2017 | GBP | Weighted Average
Derivative instruments, at their respective fair value positions
Non-Designated, Notional amount of foreign currency contracts | £						£ 4.8
Weighted Average Fixed Price | $ / £	1.569	1.569	1.569	1.569	1.569	1.569	1.569	1.569	1.569	1.569	1.569
Weighted Average Mark-to-Market | $ / £	0.042	0.042	0.042	0.042	0.042	0.042	0.042	0.042	0.042	0.042	0.042
Fair Value Amount											$ 0.2

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