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Income Taxes (Significant Components of Deferred Tax Assets and Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2013
Sep. 30, 2012
Deferred Tax Assets, Gross [Abstract]    
Retirement benefits and compensation accruals $ 347.2 $ 520.4
Tax loss carryforwards 53.3 57.4
Tax credits and other tax carryforwards 66.6 52.8
Reserves and accruals 140.3 188.9
Asset impairment 0 25.4
Currency losses 34.8 0
Other 40.1 43.2
Valuation allowance (44.7) (36.6)
Deferred Tax Assets 637.6 851.5
Deferred Tax Liabilities, Gross [Abstract]    
Plant and equipment 1,066.4 1,089.5
Currency gains 0 20.3
Unremitted earnings of foreign entities 80.6 71.9
Intangible assets 135.5 135.3
Other 17.8 10.2
Deferred Tax Liabilities 1,300.3 1,327.2
Net Deferred Income Tax Liabilities $ 662.7 $ 475.7