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Income Taxes - Summary of Open Tax Positions (Details) | 12 Months Ended
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Dec. 31, 2014
Minimum [Member] | United States Federal [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2011 |
Minimum [Member] | United States State [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2008 |
Minimum [Member] | Germany [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2010 | [1]
Minimum [Member] | Hong Kong [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2008 |
Minimum [Member] | Italy [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2008 | [1]
Minimum [Member] | Sweden [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2008 |
Minimum [Member] | United Kingdom [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2012 |
Maximum [Member] | United States Federal [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2014 |
Maximum [Member] | United States State [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2014 |
Maximum [Member] | Germany [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2014 | [1]
Maximum [Member] | Hong Kong [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2014 |
Maximum [Member] | Italy [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2014 | [1]
Maximum [Member] | Sweden [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2014 |
Maximum [Member] | United Kingdom [Member] |  |
Income Tax Contingency [Line Items] |  |
Open Tax Years by Major Tax Jurisdiction | 2014 |
[1] | Includes federal as well as local jurisdictions.

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- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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