Accumulated Other Comprehensive Income (Loss) (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Income before income taxes and equity in earnings of unconsolidated affiliates	$ 50.8	$ 79.1
Tax benefit	(16.2)	(24.7)
Net income	34.7	54.9
Employee Pension and Postretirement Benefits, Net of Tax [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Prior service costs	(0.2)	0
Actuarial losses	(0.7)	(0.3)
Other Comprehensive Income (Loss), Finalization of Pension and Other Postretirement Benefit Plan Valuation, before Tax	1.2	0
Income before income taxes and equity in earnings of unconsolidated affiliates	0.3	(0.3)
Tax benefit	(0.1)	0.1
Net income	$ 0.2	$ (0.2)