Financial Derivatives - Balance Sheet Location and Fair Value (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Other Assets [Member]
Designated Hedges - Interest Rate Swaps
Net Derivatives	$ 65.2	$ 74.6
Other Liabilities [Member]
Designated Hedges - Interest Rate Swaps
Net Derivatives	58.1	72.2
Interest Rate Contract [Member] | Other Assets [Member]
Designated Hedges - Interest Rate Swaps
Other assets and deferred costs (noncurrent)	55.4	66.5
Long-term debt	0	0
Gross derivatives	57.5	67.0
Interest Rate Contract [Member] | Other Liabilities [Member]
Designated Hedges - Interest Rate Swaps
Other assets and deferred costs (noncurrent)	0	0
Long-term debt	57.8	71.1
Gross derivatives	58.1	72.2
Foreign Exchange Contract [Member] | Other Assets [Member]
Non-designated Hedges Foreign Currency Contracts
Other assets and deferred costs (current)	2.1	0.5
Other accrued liabilities	0	0
Foreign Exchange Contract [Member] | Other Liabilities [Member]
Non-designated Hedges Foreign Currency Contracts
Other assets and deferred costs (current)	0	0
Other accrued liabilities	0.3	1.1
InterestRateContractDueFromCounterparty [Member] | Other Assets [Member]
Designated Hedges - Interest Rate Swaps
Swap Interest Receivable Offsett	15.5	15.6
InterestRateContractDueFromCounterparty [Member] | Other Liabilities [Member]
Designated Hedges - Interest Rate Swaps
Swap Interest Receivable Offsett	0	0
InterestRateContractDueToCounterparty [Member] | Other Assets [Member]
Designated Hedges - Interest Rate Swaps
Swap Interest Receivable Offsett	(7.8)	(8.0)
InterestRateContractDueToCounterparty [Member] | Other Liabilities [Member]
Designated Hedges - Interest Rate Swaps
Swap Interest Receivable Offsett	$ 0	$ 0