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Financial instruments and concentration of credit risks - Fair Value of Foreign Exchange Forward Contracts by Balance Sheet Location (Details) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total fair value	$ 3.3	$ 0.5
Prepaid expenses and other current assets | Foreign Exchange Forward Contract | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative asset	4.9	2.4
Other accrued liabilities | Foreign Exchange Forward Contract | Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative liability	$ 1.6	$ 1.9

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 20
-Section 50
-Paragraph 3
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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