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Revenue recognition - Accounts Receivable (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Revenue from Contract with Customer [Abstract]    
Billed $ 106.5 $ 102.7
Unbilled 49.8 56.4
Allowance for expected credit losses (0.4) (0.7)
Accounts receivable, net $ 155.9 $ 158.4