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Related party transactions (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2018
Kirin-Amgen, Inc. (K-A) [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Percentage of voting interests acquired |  |  | 50.00%
Kirin-Amgen [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Ownership interest (in percent) in related party | 50.00% |  |
Kirin-Amgen [Member] | Noncurrent other assets [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Approximate carrying value of the company's equity method investment | $ 570.0 |  |
Kirin-Amgen [Member] | Accrued liabilities [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Amount due to related party | 80.0 |  |
Kirin-Amgen [Member] | Selling, general and administrative [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Company's share of profits (losses) of related party | 68.0 | $ 58.0 |
Kirin-Amgen [Member] | Cost of sales [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Royalties earned by related party from Amgen | 221.0 | 239.0 |
Kirin-Amgen [Member] | Other revenues [Member] |  |  |
Related Party Transaction [Line Items] |  |  |
Revenues earned by Amgen from related party | $ 28.0 | $ 31.0 |

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