Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2018
Net loss before income taxes	$ (4.7)	$ (36.9)	$ (20.4)
UK [Member]
Net loss before income taxes	(3.7)	(23.3)	(18.9)
North America [Member]
Net loss before income taxes	(0.8)	(15.2)	(1.1)
Mainland Europe [Member]
Net loss before income taxes	0.3	1.9	(0.2)
South America [Member]
Net loss before income taxes	$ (0.5)	$ (0.3)	$ (0.2)