Pension Plan (Details 1) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2018
Components of net periodic pension benefit cost:
Interest cost	$ 0.7	$ 2.7	$ 2.9
Expected return on plan assets	$ 0.9	3.5	(3.7)
Amortization of net loss		0.3	0.4
Net periodic (benefit) cost		$ (0.5)	$ (0.3)