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Other assets - Narratives (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Deferred Costs Capitalized Prepaid And Other Assets Disclosure Abstract |  |  |  |  |
Hosting arrangement service contract implementation cost capitalized | $ 18.0 |  | $ 18.0 |  | $ 17.4
Hosting arrangement service contract accumulated amortization | 6.8 |  | 6.8 |  | 4.9
Hosting arrangement service contract, net value | 11.2 |  | 11.2 |  | $ 12.5
Hosting arrangement service amortization expense | $ 1.1 | $ 0.5 | $ 1.9 | $ 1.0 |

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