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Other assets - Narratives (Details)
$ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Deferred Costs Capitalized Prepaid And Other Assets Disclosure Abstract  
Hosting arrangement service contract implementation cost capitalized $ 13.7
Hosting arrangement service contract accumulated amortization 3.2
Hosting arrangement service contract, net value 10.5
Hosting arrangement service amortization expense $ 0.5