Fair Value Measurements (Schedule of Fair Value of Assets and Liabilities) (Details) (Fair Value [Member], USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets at Fair Value	$ 171.7	$ 125.9
Total Liabilities at Fair Value	85.9	41.3
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Total Assets at Fair Value	171.7	125.9
Total Liabilities at Fair Value	85.9	41.3
Interest rate management contract [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	78.3	35.4
Derivative liabilities	19.1	9.6
Interest rate management contract [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	78.3	35.4
Derivative liabilities	19.1	9.6
Forward Exchange Contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	93.4	90.5
Derivative liabilities	66.8	31.7
Forward Exchange Contracts [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative assets	93.4	90.5
Derivative liabilities	$ 66.8	$ 31.7