XML 176 R58.htm IDEA: XBRL DOCUMENT v3.21.2
Revenue recognition - Accounts Receivable (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Revenue from Contract with Customer [Abstract]    
Billed, net $ 210.3 $ 172.7
Unbilled 51.6 58.2
Total, net $ 261.9 $ 230.9