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Related-party Transactions - Schedules (Details) - Liberty Global - Affiliated Entity - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Assets:    
Current assets – related-party receivables $ 3.4 $ 3.2
Current liabilities:    
Accounts payable 7.8 7.0
Other accrued and current liabilities 6.6 3.5
Total current liabilities $ 14.4 $ 10.5