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New accounting standards (Details 12) - Restatement Adjustment [Member] | Dec. 31, 2015 USD ($)
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Accounting Standards Update 2015-03 debt issuance costs [Member] | Prepayments and other current assets [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Prior period reclassification adjustment | $ 100,000
Accounting Standards Update 2015-03 debt issuance costs [Member] | Other [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Prior period reclassification adjustment | 6,000,000
Accounting Standards Update 2015-17 deferred taxes [Member] | Other current assets [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Prior period reclassification adjustment | $ 33,100,000

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