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Other assets - Narratives (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Deferred Costs Capitalized Prepaid And Other Assets Disclosure Abstract |
Hosting arrangement service contract implementation cost capitalized | $ 17.4
Hosting arrangement service contract accumulated amortization | 4.9
Hosting arrangement service contract, net value | 12.5
Hosting arrangement service amortization expense | $ 2.2

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