Income Taxes - Schedule of Components of Income Tax Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 213.2	$ 118.3	$ 25.4
Deferred income taxes	(5.5)	170.7	(197.4)
Reported income tax expense (benefit)	111.5	187.3	(85.3)
H G I
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Current Federal Tax Expense (Benefit)	64.2	(32.5)	74.4
Current Foreign Tax Expense (Benefit)	46.6	47.7	38.1
Current State and Local Tax Expense (Benefit)	6.2	1.4	(0.4)
Current Income Tax Expense (Benefit)	117.0	16.6	112.1
Deferred Federal Income Tax Expense (Benefit)	12.4	169.0	(199.2)
Deferred Foreign Income Tax Expense (Benefit)	(8.3)	2.1	5.2
Deferred State and Local Income Tax Expense (Benefit)	(9.6)	(0.4)	(3.4)
Deferred income taxes	(5.5)	170.7	(197.4)
Reported income tax expense (benefit)	111.5	187.3	(85.3)
Outside of the United States
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	204.0	197.2	171.9
UNITED STATES
Components Of Deferred Income Tax Assets And Liabilities [Line Items]
Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest	$ 9.2	$ (78.9)	$ (146.5)