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New accounting standards (Details 12) - Restatement Adjustment [Member]
Dec. 31, 2015
USD ($)
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