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Other operating items - Other Operating Income (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended | 24 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 01, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2020
Other Operating Income (Loss) [Abstract] |  |  |  |  |  |
Loss of hire insurance settlement |  | $ 0.0 | $ 0.0 | $ 9.0 | $ 10.0 | $ 19.5
Receipt of overdue receivable |  | 21.0 | 0.0 | 0.0 | 26.0 |
Contingent consideration |  | 0.0 | 7.0 | 0.0 | 0.0 |
Settlement with shipyard |  | 0.0 | 0.0 | 0.0 | 3.0 |
Total other operating income | [1] | $ 21.0 | $ 7.0 | $ 9.0 | $ 39.0 |
[1] | Includes transactions with related parties. Refer to Note 32 - "Related party transactions" for further details.

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- Definition Amount of excess (deficiency) of insurance recovery over the loss incurred from an insured event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6397426&loc=d3e17499-108355 + Details
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