Retirement Benefits (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at end of year	$ 3,367.0	$ 3,213.3
Private equity [Member] | U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at end of year	80.4	83.2
Alternative equity [Member] | U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at end of year	42.1	53.4
Insurance contracts [Member] | U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at end of year	0.8	0.8
Insurance contracts [Member] | Non-U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at end of year	45.5	38.5
Real estate [Member] | Non-U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at end of year	52.9	46.2
Other [Member] | Non-U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at end of year	7.2	7.2
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of year	180.3	169.8
Realized Gains	5.5	22.4
Unrealized Gains (Losses)	(5.1)	(2.7)
Purchases, Sales, Issuances, and Settlements, Net	0.6	(9.2)
Plan assets at end of year	181.3	180.3
Fair Value, Inputs, Level 3 [Member] | Private equity [Member] | U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of year	83.2	85.0
Realized Gains	6.6	18.0
Unrealized Gains (Losses)	(10.8)	(9.3)
Purchases, Sales, Issuances, and Settlements, Net	1.4	(10.5)
Plan assets at end of year	80.4	83.2
Fair Value, Inputs, Level 3 [Member] | Alternative equity [Member] | U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of year	53.4	49.0
Realized Gains	(1.1)	4.4
Unrealized Gains (Losses)	4.1	(1.4)
Purchases, Sales, Issuances, and Settlements, Net	(14.3)	1.4
Plan assets at end of year	42.1	53.4
Fair Value, Inputs, Level 3 [Member] | Insurance contracts [Member] | U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of year	0.8	0.9
Realized Gains
Unrealized Gains (Losses)
Purchases, Sales, Issuances, and Settlements, Net	0	(0.1)
Plan assets at end of year	0.8	0.8
Fair Value, Inputs, Level 3 [Member] | Insurance contracts [Member] | Non-U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of year	38.5	26.9
Realized Gains
Unrealized Gains (Losses)	1.0	7.9
Purchases, Sales, Issuances, and Settlements, Net	6.0	3.7
Plan assets at end of year	45.5	38.5
Fair Value, Inputs, Level 3 [Member] | Real estate [Member] | Non-U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of year	0	3.9
Realized Gains
Unrealized Gains (Losses)	0.4
Purchases, Sales, Issuances, and Settlements, Net	7.9	(3.9)
Plan assets at end of year	8.3	0
Fair Value, Inputs, Level 3 [Member] | Other [Member] | Non-U.S. Pension Benefit Plans [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at beginning of year	4.4	4.1
Realized Gains
Unrealized Gains (Losses)	0.2	0.1
Purchases, Sales, Issuances, and Settlements, Net	(0.4)	0.2
Plan assets at end of year	$ 4.2	$ 4.4