Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net (Loss) Earnings	$ (59.5)	$ 3.3	$ 34.1	$ 33.7
Pension and postretirement benefits adjustments:
Unrealized pension and postretirement benefit obligations	0.0	0.0	0.0	1.6
Reclassifications to net (loss) earnings	(0.5)	(0.7)	(1.7)	(0.2)
Unrealized gain on plan amendment	0.0	0.0	0.0	36.1
Cash flow hedge adjustments:
Unrealized net (loss) on derivatives designated as cash flow hedges	(2.7)	0.0	(2.7)	0.0
Reclassifications to net (loss) earnings	0.3	0.0	0.3	0.0
Foreign currency translation adjustments:
Unrealized foreign currency translation adjustments	2.1	(0.2)	0.8	9.7
Reclassifications to net (loss) earnings	0.0	0.0	0.0	(1.3)
Tax benefit (expense) on other comprehensive (loss) income	1.2	0.3	1.7	(14.3)
Total Comprehensive (Loss) Income	$ (59.1)	$ 2.7	$ 32.5	$ 65.3