Unconsolidated Affiliated Company (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Oct. 31, 2012	Jul. 31, 2012	Apr. 30, 2012	Jan. 31, 2012	Oct. 31, 2011	Jul. 31, 2011	Apr. 30, 2011	Jan. 31, 2011	Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Unconsolidated Affiliated Company
Ownership percentage in equity method investee	50.00%								50.00%
Operations:
Finance income									$ 11.2	$ 9.9	$ 9.5
Net income (loss)									2.8	2.3	1.7
The Company's equity in net income (loss)	0.5	0.1	0.3	0.5	0.4	0.2	0.3	0.3	1.4	1.2	0.9
Financial Position:
Total assets	137.2				115.6				137.2	115.6
Total external borrowings	110.7				95.8				110.7	95.8
Total net assets	17.4				16.3				17.4	16.3
The Company's share of net assets	$ 8.7				$ 8.1				$ 8.7	$ 8.1