Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Deferred tax assets:
Compensation and benefit accruals not currently deductible	$ 77.6	$ 87.9
Net operating loss carry forwards	57.0	55.7
Self insurance reserves	50.2	50.1
Research and experimentation and other tax credits	42.4	37.5
Pension liability	58.7	53.9
Accrued liabilities	86.5	64.4
Other	4.0	1.8
Total deferred tax assets	376.4	351.3
Deferred tax liabilities:
Unearned revenue	(167.8)	(169.5)
Depreciation and amortization	(18.8)	(32.3)
Acquired intangible assets	(21.4)	(29.1)
State taxes	(3.8)	(3.7)
Investments in joint ventures/non-controlled subsidiaries	(1.6)	(8.8)
Total deferred tax liabilities	(213.4)	(243.4)
Valuation allowance	(19.2)	(17.8)
Net deferred tax assets	143.8	90.1
Net operating loss carry forwards
Tax-deductible goodwill	306.6	343.2
Income Taxes, additional disclosures
Unused federal research and development credits	12.7
Unused state research and development credits which can be carried forward indefinitely	11.5
California Enterprise Zone Tax Credits which can be carried forward indefinitely	2.0
Net deferred tax asset likely to be realized and for which no additional valuation allowance has been provided	357.2
Undistributed earnings from non-U.S. subsidiaries	797.4
Liability for unrecognized tax benefits, including potential interest and penalties, net of related tax benefit	56.3
Unrecognized tax benefits that would be included in the effective tax rate if recognized	50.8
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits
Balance at the beginning of the year	58.1	70.5
Gross increase in prior years' tax positions	3.7	5.3
Gross decrease in prior years' tax positions	(4.4)	(13.7)
(Decrease) due to settlement with tax authorities	(5.2)	(2.9)
Gross increase in current periods tax positions	4.9	4.9
Lapse of statute of limitations	(1.3)	(6.0)
Balance at the end of the year	55.8	58.1
Accrued interest, excluding any related income tax benefits	9.6	10.5
Accrued penalties, excluding any related income tax benefits	0.1	0.1
Maximum
Net operating loss carry forwards
Period of amortization of goodwill	P15Y
State
Net operating loss carry forwards
Net operating loss carry forwards	257.3
Foreign
Net operating loss carry forwards
Net operating loss carry forwards	$ 201.9