Contract Liabilities and Other Disclosures (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2019	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Balance at beginning	$ (33.1)	$ (32.0)	$ (27.3)
Revenue recognized	3.0	13.5	10.6
Revenue deferred	(2.4)	(11.0)	(16.9)
Acquisitions		(0.4)
Foreign currency translation adjustments	0.5	2.1	0.5
Balance at ending	$ (32.0)	$ (27.8)	$ (33.1)