Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Operating loss carryforwards
Earnings resulting from income Taxes on undistributed earnings from foreign operations	$ 42.0
Unrecognized tax benefits	53.3	52.1	63.8
Gross unrecognized tax benefits, excluding income tax penalties and interest	54.4
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Balance at beginning of year	52.1	63.8
Additions for tax positions related to the current year	4.0	5.1
Additions for tax positions related to prior years	4.0	11.5
Reductions for tax positions of prior years	(0.3)	(2.8)
Settlements	(2.0)	(19.7)
Lapse of statute of limitations	(4.5)	(5.8)
Balance at end of year	53.3	52.1	63.8
Interest and penalties	(1.7)	(0.9)	2.4
Accruals for payment of interest and penalties	14.1	12.0
Estimated reduction in unrecognized tax benefits due to tax audit resolutions during the next twelve months	13.4
State Jurisdiction
Operating loss carryforwards
Net operating loss carryforwards	169.9
Deferred tax assets for net operating loss carryforwards	9.3
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Valuation allowance against deferred tax assets	4.2
Foreign Country
Operating loss carryforwards
Net operating loss carryforwards	178.0
Foreign tax credit carryforwards expiration period, minimum (in years)	5
Deferred tax assets for net operating loss carryforwards	48.1
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Valuation allowance against deferred tax assets	$ 35.3