Derivatives and Hedging Activities (Details) (USD $) In Millions, unless otherwise specified																																3 Months Ended		9 Months Ended		3 Months Ended	9 Months Ended	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Feb. 26, 2013 Fixed rate notes	Mar. 31, 2013 Interest Rate Swaps	Jun. 30, 2012 Interest Rate Swaps	Mar. 31, 2013 Foreign Currency Contracts	Jun. 30, 2012 Foreign Currency Contracts	Mar. 31, 2013 Commodity Contracts	Jun. 30, 2012 Commodity Contracts	Mar. 31, 2013 Other current assets	Jun. 30, 2012 Other current assets	Mar. 31, 2013 Other current assets Interest Rate Swaps	Jun. 30, 2012 Other current assets Interest Rate Swaps	Mar. 31, 2013 Other current assets Foreign Currency Contracts	Jun. 30, 2012 Other current assets Foreign Currency Contracts	Mar. 31, 2013 Other current assets Commodity Contracts	Mar. 31, 2013 Other assets	Jun. 30, 2012 Other assets	Mar. 31, 2013 Other assets Interest Rate Swaps	Jun. 30, 2012 Other assets Interest Rate Swaps	Mar. 31, 2013 Accrued liabilities	Jun. 30, 2012 Accrued liabilities	Mar. 31, 2013 Accrued liabilities Foreign Currency Contracts	Jun. 30, 2012 Accrued liabilities Foreign Currency Contracts	Mar. 31, 2013 Accrued liabilities Commodity Contracts	Jun. 30, 2012 Accrued liabilities Commodity Contracts	Mar. 31, 2013 Other liabilities	Jun. 30, 2012 Other liabilities	Jun. 30, 2012 Other liabilities Foreign Currency Contracts	Mar. 31, 2013 Other liabilities Commodity Contracts	Jun. 30, 2012 Other liabilities Commodity Contracts	Mar. 31, 2013 Cash flow hedges	Mar. 31, 2012 Cash flow hedges	Mar. 31, 2013 Cash flow hedges	Mar. 31, 2012 Cash flow hedges	Mar. 31, 2013 Cash flow hedges Interest Rate Swaps	Mar. 31, 2013 Cash flow hedges Interest Rate Swaps	Mar. 31, 2013 Cash flow hedges Foreign Currency Contracts	Mar. 31, 2012 Cash flow hedges Foreign Currency Contracts	Mar. 31, 2013 Cash flow hedges Foreign Currency Contracts	Mar. 31, 2012 Cash flow hedges Foreign Currency Contracts	Mar. 31, 2013 Cash flow hedges Commodity Contracts	Mar. 31, 2012 Cash flow hedges Commodity Contracts	Mar. 31, 2013 Cash flow hedges Commodity Contracts	Mar. 31, 2012 Cash flow hedges Commodity Contracts	Mar. 31, 2013 Fair Value Hedging Interest Rate Swaps	Mar. 31, 2012 Fair Value Hedging Interest Rate Swaps	Mar. 31, 2013 Fair Value Hedging Interest Rate Swaps	Mar. 31, 2012 Fair Value Hedging Interest Rate Swaps	Jun. 30, 2012 Fair Value Hedging Interest Rate Swaps
Fair value of derivatives
Issuance of fixed rate notes			$ 300
Amount of Gain (Loss) Recognized in AOCI on Derivatives (Effective Portion)																																0.2	(14.6)	(6.7)	(62.5)	2.7	2.7	0.6	(0.1)	1.2	0.5	(4.0)	(14.5)	(10.6)	(63.0)
Total notional amounts of interest rate contracts																																														45.0		45.0		45.0
Net gains recorded as a reduction to interest expense																																														0.4	0.4	1.2	1.0
Derivatives designated as hedging instruments, Asset	2.1	2.6		1.0	1.4	1.0	1.2	0.1		1.9	1.4	0.8	0.2	1.0	1.2	0.1	0.2	1.2	0.2	1.2
Derivatives designated as hedging instruments, Liability	$ 45.4	$ 56.5				$ 0.9	$ 1.9	$ 44.5	$ 54.6												$ 17.6	$ 26.5	$ 0.9	$ 1.5	$ 16.7	$ 25.0	$ 27.8	$ 30.0	$ 0.4	$ 27.8	$ 29.6