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Income Taxes - Deferred tax (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Sep. 30, 2017
Deferred tax assets:
Compensation and benefit accruals not currently deductible	$ 132.9	$ 108.3
Net operating loss carryforwards	228.2	252.4
Self insurance reserves	12.9	13.5
Research and experimentation and other tax credits	120.5	178.1
Pension liability	105.1	88.2
Accrued liabilities	125.4	63.4
Other	28.8	27.8
Total deferred tax assets	753.8	731.7
Deferred tax liabilities:
Unearned revenue	(106.9)	(121.1)
Depreciation and amortization	(78.5)	(135.9)
Acquired intangible assets	(49.6)	(56.0)
Investment in subsidiaries	(108.7)	(109.5)
Total deferred tax liabilities	(343.7)	(422.5)
Valuation allowance	(169.1)	(197.1)
Net deferred tax assets	241.0	112.1
Income Taxes, additional disclosures
Remaining gross tax asset exclusive of tax liabilities realized	584.7
Change in valuation allowance	28.0
Change in valuation allowance for foreign tax credits	38.1
Gross book-tax differences from non-U.S. subsidiaries	1,800.0
Liability for unrecognized tax benefits, including potential interest and penalties, net of related tax benefit	75.4	71.9
Unrecognized tax benefits	62.4	60.0		$ 102.1
Unrecognized tax benefits that would be included in the effective tax rate if recognized			$ 45.2
Canada
Deferred tax liabilities:
Valuation allowance	(6.0)
Income Taxes, additional disclosures
Change in valuation allowance		13.1
United States
Deferred tax liabilities:
Valuation allowance		$ (38.1)
California Franchise Tax Board | Enterprise Zone Tax Credits
Income Taxes, additional disclosures
Unused tax credits	6.8
Federal
Income Taxes, additional disclosures
Net operating loss carryforwards	654.2
Federal | Research and development
Income Taxes, additional disclosures
Unused tax credits	77.6
State | Research and development
Income Taxes, additional disclosures
Unused tax credits	40.3
Foreign
Income Taxes, additional disclosures
Net operating loss carryforwards	$ 945.8

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