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Summary of significant accounting policies (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Property, Plant and Equipment [Line Items] |  |  |
Allowance for Doubtful Accounts Receivable, Current | $ 1,400,000 | $ 1,250,000 |
Amortization of Long-term Assets | 16,800,000 | 18,000,000 | $ 13,500,000
Impairment of Long-Lived Assets Held-for-use | $ 0 |  |
Warranty Period | 12 months |  |
Advertising Expense | $ 64,700,000 | $ 47,200,000 | $ 55,500,000
Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-term Assets, Amortization Period | 24 months |  |
Useful life (in years) | 1 year |  |
Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Long-term Assets, Amortization Period | 36 months |  |
Useful life (in years) | 10 years |  |
European Union [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Warranty Period | 2 years |  |
Deferred Income Tax Charge [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 22,200,000 |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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