Long-Term Debt (Bank Credit Facility) (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012	Oct. 21, 2010
Debt Instrument [Line Items]
Unamortized balance included in other assets	$ 5.0
Bank Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowings capacity	300.0	750.0
Term loan maximum additional borrowing capacity	300.0
Outstanding borrowings under the credit facility, percentage	1.74%
Debt issuance cost capitalized	7.3
Term Loan [Member] | Bank Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowings capacity		150.0
Term loan period	5
Same-Day Swing Line Loan [Member] | Bank Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowings capacity		50.0
Stand-By Letters of Credit [Member] | Bank Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowings capacity		25.0
Previous Credit Facility [Member] | Bank Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility maximum borrowings capacity	200.0
Revolving Credit Facility [Member] | Bank Credit Facility [Member]
Debt Instrument [Line Items]
Line of credit facility outstanding	125.0
Credit facility maximum borrowings capacity		600.0
Principal Payment From October 1, 2015 Through September 30, 2016 [Member] | Term Loan [Member] | Bank Credit Facility [Member]
Debt Instrument [Line Items]
Term loan principal payment	3.8
Principal Payment Through September 30, 2015 [Member] | Term Loan [Member] | Bank Credit Facility [Member]
Debt Instrument [Line Items]
Term loan principal payment	$ 1.9