Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI beginning balance	$ 8.2	$ 4.5
OCI before reclassifications:
Amount before tax	(22.7)	8.3
Income tax	0	(4.6)
Amount net of tax	(22.7)	3.7
Reclassifications to earnings
Amount before Tax	(1.1)
Income tax	0.4
Amount net of tax	(0.7)	0
Net OCI	(23.4)	3.7
AOCI ending balance	(15.2)	8.2
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI beginning balance	0.2	4.5
OCI before reclassifications:
Amount before tax	(22.7)	(4.3)
Income tax	0	0
Amount net of tax	(22.7)	(4.3)
Reclassifications to earnings
Amount before Tax	0
Income tax	0
Amount net of tax	0	0
Net OCI	(22.7)	(4.3)
AOCI ending balance	(22.5)	0.2
Unrealized Gain on Interest Rate Lock [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
AOCI beginning balance	8.0	0
OCI before reclassifications:
Amount before tax	0	12.6
Income tax	0	(4.6)
Amount net of tax	0	8.0
Reclassifications to earnings
Amount before Tax	(1.1)
Income tax	0.4
Amount net of tax	(0.7)	0
Net OCI	(0.7)	8.0
AOCI ending balance	$ 7.3	$ 8.0