Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Employee Pension and Postretirement Benefits, Net of Tax
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (1.3)	$ (0.8)
Tax benefit	0.5	0.3
Net of tax	(0.8)	(0.5)
Prior service costs
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	(0.2)	(0.2)
Actuarial losses
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total before tax	$ (1.1)	$ (0.6)