Accumulated Other Comprehensive Income (Loss) Rollforward (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Sep. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	$ (10.3)		$ (10.3)		$ (6.4)
Other comprehensive loss	(0.2)	0	(3.9)	(6.4)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	(8.1)		(8.1)		(4.1)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(4.0)
Other comprehensive loss			(4.0)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	(2.6)		(2.6)		(2.8)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			0.2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
Other comprehensive loss			0.2
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	0.4		0.4		0.5
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(0.1)
Other comprehensive loss			(0.1)
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	(10.3)		(10.3)		(6.4)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax			(3.9)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax			0
Other comprehensive loss			$ (3.9)