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Financial Instruments - Foreign currency derivatives (Details) - Foreign currency contracts [Member] € in Millions, ₩ in Millions, ¥ in Millions, ¥ in Millions, £ in Millions, MXN in Millions, HUF in Millions, $ in Millions | Dec. 31, 2015 USD ($) | Dec. 31, 2015 HUF | Dec. 31, 2015 JPY (¥) | Dec. 31, 2015 KRW (₩) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2015 EUR (€) | Dec. 31, 2015 MXN | Dec. 31, 2014 USD ($) | Dec. 31, 2014 JPY (¥) | Dec. 31, 2014 KRW (₩) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2014 EUR (€) | Dec. 31, 2014 GBP (£)
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Dec - 16 | Chinese yuan |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ 13.8 |  |  |  |  | € 30.5 |  | $ 24.9 |  |  |  |  |
Dec - 16 | Euro |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | 30.1 | HUF 3,434.5 | ¥ 487.1 |  |  |  |  | 23.5 | ¥ 4,371.8 |  |  |  |
Dec - 16 | Japanese yen |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | 3.0 |  |  | ₩ 5,998.9 | ¥ 92.6 |  |  | 3.8 |  | ₩ 6,712.5 | ¥ 88.6 |  |
Dec - 16 | Korean won |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ 77.9 |  |  |  |  | € 2.5 |  | 22.7 |  |  |  | € 2.5 |
Sept - 16 | US dollar |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | MXN |  |  |  |  |  |  | MXN 469.0 |  |  |  |  |  |
Dec - 15 | Euro |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | £ |  |  |  |  |  |  |  |  |  |  |  |  | £ 5.7
Dec - 15 | Korean won |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | ¥ |  |  |  |  |  |  |  |  | ¥ 72.0 |  |  |  |
Dec - 15 | Mexican peso |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | $ |  |  |  |  |  |  |  | $ 22.6 |  |  |  |  |
Dec - 15 | Swedish krona |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative, Notional Amount | € |  |  |  |  |  |  |  |  |  |  |  | € 31.4 |

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