Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)		$ 0.4	$ (1.1)	$ 26.9	$ (9.4)
Unrealized foreign currency translation gain (loss), net of tax	[1]	4.2	5.7	5.3	(7.0)
Unrealized gain on interest rate hedges, net of tax		2.2	0.3	4.1	0.3
Other comprehensive income (loss), net of tax		6.4	6.0	9.4	(6.7)
Total comprehensive income (loss), net of tax attributable to Nexeo Solutions, Inc.		$ 6.8	$ 4.9	$ 36.3	$ (16.1)

[1] Tax effects are not material.