Accumulated Other Comprehensive Income (Loss) Rollforward (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	$ (10.8)		$ (11.6)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax	0
Other comprehensive loss	0.8	(0.9)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	(9.0)		(8.7)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(0.3)
Other comprehensive loss	(0.3)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	(3.5)		(3.5)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax	0
Other comprehensive loss	0
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	1.7		0.6
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	1.1
Other comprehensive loss	1.1
Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss, net	(10.8)		(11.6)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.8
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0
Other comprehensive loss	$ 0.8