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Financial Instruments - Derivatives (Details) € in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, kr in Millions, $ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2018 USD ($) t	Sep. 30, 2018 JPY (¥)	Sep. 30, 2018 KRW (₩)	Sep. 30, 2018 CNY (¥)	Sep. 30, 2018 SEK (kr)	Sep. 30, 2018 EUR (€)	Sep. 30, 2018 MXN ($)	Sep. 30, 2018 GBP (£)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 JPY (¥)	Dec. 31, 2017 KRW (₩)	Dec. 31, 2017 CNY (¥)	Dec. 31, 2017 SEK (kr)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 MXN ($)	Dec. 31, 2017 GBP (£)
Commodity contracts | Maturity December 2018
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Mass | t	327.9
Brazil, Brazil Real | Foreign currency | Maturity December 2018
Derivative [Line Items]
Notional amount of currency derivatives | €						€ 0.9								€ 1.1
United Kingdom, Pounds | Foreign currency | Maturity December 2018
Derivative [Line Items]
Notional amount of currency derivatives	$ 2.9					8.8			$ 0.0					0.0
China, Yuan Renminbi | Foreign currency | Maturity June 2018
Derivative [Line Items]
Notional amount of currency derivatives | €						0.0								18.6
China, Yuan Renminbi | Foreign currency | Maturity September 2018
Derivative [Line Items]
Notional amount of currency derivatives	0.0								36.0
Euro Member Countries, Euro | Cross Currency Interest Rate Contract [Member] | Maturity September 2020
Derivative [Line Items]
Notional amount of currency derivatives	206.2
Euro Member Countries, Euro | Foreign currency | Maturity December 2018
Derivative [Line Items]
Notional amount of currency derivatives		¥ 281.3		¥ 18.3				£ 1.0		¥ 1,311.3		¥ 85.0				£ 3.9
Euro Member Countries, Euro | Foreign currency | Maturity March 2019
Derivative [Line Items]
Notional amount of currency derivatives	13.3								56.5
Euro Member Countries, Euro | Foreign currency | Maturity June 2019
Derivative [Line Items]
Notional amount of currency derivatives | kr					kr 467.6								kr 267.4
Japan, Yen | Cross Currency Interest Rate Contract [Member] | Maturity February 2023
Derivative [Line Items]
Notional amount of currency derivatives	10,977.5
Japan, Yen | Foreign currency | Maturity December 2018
Derivative [Line Items]
Notional amount of currency derivatives	0.8			¥ 24.7					0.0			¥ 0.0
Korea (South), Won | Foreign currency | Maturity December 2018
Derivative [Line Items]
Notional amount of currency derivatives	16.3	¥ 202.1				0.3			$ 11.2	¥ 619.0				3.1
Sweden, Kronor | Foreign currency | Maturity January 2020
Derivative [Line Items]
Notional amount of currency derivatives | €						70.2								109.7
United States of America, Dollars | Cross Currency Interest Rate Contract [Member] | Maturity September 2020
Derivative [Line Items]
Notional amount of currency derivatives	250.0
United States of America, Dollars | Cross Currency Interest Rate Contract [Member] | Maturity February 2023
Derivative [Line Items]
Notional amount of currency derivatives	$ 100.0
United States of America, Dollars | Foreign currency | Maturity December 2018
Derivative [Line Items]
Notional amount of currency derivatives			₩ 44,902.3			€ 50.0	$ 139.2				₩ 0.0			€ 42.0	$ 0.0

X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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- Definition

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+ References

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- Definition

Nominal mass used to calculate payments on a derivative instrument.

+ References

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