Segment Reporting and Geographic Information (Details 2) - USD ($) $ in Millions	Jun. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Total non-current assets excluding goodwill	$ 80.7	$ 103.5
Italy [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total non-current assets excluding goodwill	2.1	3.4
Greece [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total non-current assets excluding goodwill	28.4	36.2
UK [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total non-current assets excluding goodwill	45.1	60.0
Rest of World [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Total non-current assets excluding goodwill	$ 5.1	$ 3.9