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Financial Instruments - Derivatives (Details) € in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, kr in Millions, $ in Millions, $ in Millions | 6 Months Ended |  |
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Jun. 30, 2018 USD ($) t | Jun. 30, 2018 JPY (¥) | Jun. 30, 2018 CNY (¥) | Jun. 30, 2018 SEK (kr) | Jun. 30, 2018 EUR (€) | Jun. 30, 2018 MXN ($) | Jun. 30, 2018 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 JPY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 SEK (kr) | Dec. 31, 2017 EUR (€) | Dec. 31, 2017 MXN ($) | Dec. 31, 2017 GBP (£)
Commodity contracts | Maturity December 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | t | 151.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Brazil, Brazil Real | Foreign currency | Maturity December 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | € |  |  |  |  | € 1.9 |  |  |  |  |  |  | € 1.1 |  |
United Kingdom, Pounds | Foreign currency | Maturity December 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | $ 5.8 |  |  |  | 15.9 |  |  | $ 0.0 |  |  |  | 0.0 |  |
China, Yuan Renminbi | Foreign currency | Maturity September 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | 11.6 |  |  |  |  |  |  | 36.0 |  |  |  |  |  |
China, Yuan Renminbi | Foreign currency | Maturity June 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | € |  |  |  |  | 0.0 |  |  |  |  |  |  | 18.6 |  |
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 |  | ¥ 525.3 | ¥ 37.0 |  |  |  | £ 2.0 |  | ¥ 1,311.3 | ¥ 85.0 |  |  |  | £ 3.9
Euro Member Countries, Euro | Foreign currency | Maturity June 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | kr |  |  |  | kr 267.4 |  |  |  |  |  |  | kr 267.4 |  |  |
Euro Member Countries, Euro | Foreign currency | Maturity March 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | 24.7 |  |  |  |  |  |  | 56.5 |  |  |  |  |  |
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 | 1.4 |  | ¥ 44.0 |  |  |  |  | 0.0 |  | ¥ 0.0 |  |  |  |
Korea (South), Won | Foreign currency | Maturity December 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | 29.8 | ¥ 213.5 |  |  | 0.8 |  |  | $ 11.2 | ¥ 619.0 |  |  | 3.1 |  |
Sweden, Kronor | Foreign currency | Maturity January 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount of currency derivatives | € |  |  |  |  | 83.1 |  |  |  |  |  |  | 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 |  |  |  |  | € 0.0 | $ 264.9 |  |  |  |  |  | € 42.0 | $ 0.0 |

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