Retirement Benefits (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Plan assets at end of year	$ 3,591.0	$ 3,367.0
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	78.8	80.4
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	49.9	42.1
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	0.9	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	57.8	45.5
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	88.9	52.9
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	5.9	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	181.3	180.3
Realized Gains	9.1	5.5
Unrealized Gains (Losses)	13.7	(5.1)
Purchases, Sales, Issuances, and Settlements, Net	(4.8)	0.6
Plan assets at end of year	199.3	181.3
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	80.4	83.2
Realized Gains	7.8	6.6
Unrealized Gains (Losses)	(3.5)	(10.8)
Purchases, Sales, Issuances, and Settlements, Net	(5.9)	1.4
Plan assets at end of year	78.8	80.4
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	42.1	53.4
Realized Gains	1.3	(1.1)
Unrealized Gains (Losses)	2.8	4.1
Purchases, Sales, Issuances, and Settlements, Net	3.7	(14.3)
Plan assets at end of year	49.9	42.1
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	0.8
Realized Gains
Unrealized Gains (Losses)
Purchases, Sales, Issuances, and Settlements, Net	0.1
Plan assets at end of year	0.9	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	45.5	38.5
Realized Gains
Unrealized Gains (Losses)	14.1	1.0
Purchases, Sales, Issuances, and Settlements, Net	(1.8)	6.0
Plan assets at end of year	57.8	45.5
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	8.3	0
Realized Gains
Unrealized Gains (Losses)	0.3	0.4
Purchases, Sales, Issuances, and Settlements, Net	0	7.9
Plan assets at end of year	8.6	8.3
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	4.2	4.4
Realized Gains
Unrealized Gains (Losses)		0.2
Purchases, Sales, Issuances, and Settlements, Net	(0.9)	(0.4)
Plan assets at end of year	$ 3.3	$ 4.2