Derivatives And Hedging Activities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011	Jun. 30, 2011
Derivatives And Hedging Activities [Abstract]
Total notional amount of floating interest rate contracts	$ 45.0		$ 45.0		$ 65.0
Gains recorded as a reduction to interest expense	0.4	0.6	1.0	1.9
Derivative losses included in AOCI expected to be reclassified into earnings			22.8
Ineffectiveness on cash flow hedges	0	0	0	0
Cash collateral held by counterparties	$ 0		$ 0		$ 0