Income Taxes - Components of Deferred Income Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Income Taxes [Line Items]
Deferred Tax Assets, Net, Current	$ 43.0	$ 47.9
Deferred Tax Liabilities, Net, Current	(7.9)	(14.8)
Deferred Tax Assets, Net, Noncurrent	909.9	873.3
Deferred Tax Liability Noncurrent	(1,291.6)	(1,105.6)
Deferred tax liabilities (Note 21)	533.3	492.8
Deferred Tax Assets, Net	952.9	921.2
Deferred tax assets (Note 21)	186.7	293.4
Deferred Tax Liabilities, Net	(1,299.5)	(1,120.4)
Current
Income Taxes [Line Items]
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	22.9	15.4
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges	6.3	7.1
Deferred Tax Assets, Inventory	25.6	24.3
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	6.4	5.4
Deferred Tax Assets Marketing and Promotional Accruals	16.0	14.1
Deferred Tax Assets Capitalized Transaction Costs	0	0.1
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	14.7	12.6
Deferred Tax Assets, Other	17.2	23.9
Deferred Tax Assets, Valuation Allowance	(66.1)	(55.0)
Deferred Tax Liabilities, Inventory	(0.7)	(2.7)
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	(1.2)	(0.4)
Deferred Tax Liabilities, Other	(6.0)	(11.7)
Noncurrent
Income Taxes [Line Items]
Deferred Tax Liability, Long Term Debt	10.0	0
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Postretirement Benefits	61.4	49.5
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Restructuring Charges	0.7	0.3
Deferred Tax Assets Capitalized Transaction Costs	0.6	0.6
Deferred Tax Assets, Unrealized Losses on Available-for-Sale Securities, Gross	0.3	2.1
Deferred Tax Assets, Operating Loss Carryforwards	930.6	1,029.5
Deferred Tax Assets, Other	76.6	32.8
Deferred Tax Assets, Valuation Allowance	(712.4)	(762.2)
Deferred Tax Liabilities, Unrealized Gains on Trading Securities	(20.0)	(13.1)
Deferred Tax Liabilities, Other	(19.3)	(23.4)
Deferred Tax Assets Prepaid Royalties	6.6	7.0
Deferred Tax Assets, Property, Plant and Equipment	9.0	9.7
Deferred Tax Assets Long Term Debt	0	0.7
Deferred Tax Assets, Goodwill and Intangible Assets	8.5	3.9
Deferred Tax Assets Deferred Acquisition Costs	0.4	0.4
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Policyholder Liabilities	483.8	477.7
Deferred Tax Assets, Equity Method Investments	43.8	21.3
Deferred Tax Liabilities, Property, Plant and Equipment	(22.6)	(27.5)
Deferred Tax Liabilities, Intangible Assets	(744.1)	(735.5)
Deferred Tax Liabilities Value of Business Acquired	(20.8)	(67.3)
Deferred Tax Assets Acquisition Costs	(104.2)	(63.7)
Deferred Tax Liabilities Tax on Unremitted Foreign Earnings	(2.6)	(18.6)
Deferred Tax Liabilities, Investments	(338.3)	(156.5)
Deferred Tax Liability, Funds Withheld Receivables from Reinsurance Agreements	$ 9.7	$ 0