Debt (Details) (USD $) In Millions, unless otherwise specified						3 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012	Dec. 31, 2013 Fixed-rate Debt [Member]	Dec. 31, 2012 Fixed-rate Debt [Member]	Dec. 31, 2013 Private Placement Notes [Member]	Dec. 31, 2012 Private Placement Notes [Member]	Dec. 31, 2013 Senior Notes Due May 2021 [Member]	Dec. 31, 2012 Senior Notes Due May 2021 [Member]	Dec. 31, 2013 Senior Notes Due May 2022 [Member]	Dec. 31, 2012 Senior Notes Due May 2022 [Member]	Dec. 31, 2013 Debt Covered By Interest Rate Swap Agreements [Member]
Debt Instrument [Line Items]
Long-term Debt, Fair Value	$ 2,226.5		$ 2,262.3
Short-term Debt [Abstract]
Notes payable	161.1	99.0	99.0
Short-term Debt, Weighted Average Interest Rate	2.70%		3.60%
Long-term Debt	2,138.8		2,138.8	2,138.8	2,138.8	1,040.0	1,040.0	600.0	600.0	498.8	498.8
Current maturities of long-term debt	220.0	140.0	140.0
Long-term debt	1,918.8	1,998.8	1,998.8
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum						5.20%
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum						6.60%
Debt Instrument, Interest Rate, Stated Percentage								4.70%		4.70%
Debt, Long-term and Short-term, Combined Amount	2,299.9											161.1
Total Committed Debt Facilities	2,719.9
Receivables Securitization Program, Maximum Borrowing Capacity	200
Receivables Securitization Program, Amount Outstanding	106.0
Long-term Debt, Fiscal Year Maturity [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	220.0
Long-term Debt, Maturities, Repayments of Principal in Year Two	220.0
Long-term Debt, Maturities, Repayments of Principal in Year Three	290.0
Long-term Debt, Maturities, Repayments of Principal in Year Four	310.0
Long-term Debt, Maturities, Repayments of Principal in Year Five	0
Long-term Debt, Maturities, Repayments of Principal after Year Five	1,100.0
Net Monetary Assets in Venezuela	$ 64.9