Segment Reporting and Geographic Information (Details) - Schedule of geographic information non-current assets excluding goodwill - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Segment Reporting and Geographic Information (Details) - Schedule of geographic information non-current assets excluding goodwill [Line Items]
Total non-current assets excluding goodwill	$ 133.4	$ 151.2
UK [Member]
Segment Reporting and Geographic Information (Details) - Schedule of geographic information non-current assets excluding goodwill [Line Items]
Total non-current assets excluding goodwill	101.9	116.1
Greece [Member]
Segment Reporting and Geographic Information (Details) - Schedule of geographic information non-current assets excluding goodwill [Line Items]
Total non-current assets excluding goodwill	21.4	26.5
Italy [Member]
Segment Reporting and Geographic Information (Details) - Schedule of geographic information non-current assets excluding goodwill [Line Items]
Total non-current assets excluding goodwill	2.2	2.3
Rest of world [Member]
Segment Reporting and Geographic Information (Details) - Schedule of geographic information non-current assets excluding goodwill [Line Items]
Total non-current assets excluding goodwill	$ 7.9	$ 6.3