Receivables (Details) - Customer Financing, Recorded Investment (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Recorded investment principal and interest due, net of deferred interest and fees of
Individually evaluated for impairment	$ 82.4	$ 123.2
Collectively evaluated for impairment	391.0	307.1
Total	473.4	430.3
Allowances for Credit Losses [Abstract]
Individually evaluated for impairment	63.4	59.9
Collectively evaluated for impairment	15.1	12.9
Total	78.5	72.8
Deferred interest and fees	$ 7.0	$ 8.1