Borrowings (Outstanding Borrowings) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2012
Two Thousand Twelve Term Loan [Member]
Line of Credit Facility [Line Items]
Total Capacity	$ 400.0
Outstanding Borrowings	400.0
Two Thousand Twelve Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Total Capacity	500.0
Senior Notes [Member]
Line of Credit Facility [Line Items]
Expiration Date	Jun. 01, 2017
Total Capacity	124.4
Outstanding Borrowings	124.4
Total Debt [Member]
Line of Credit Facility [Line Items]
Unused Available Capacity	500.0
Total Capacity	1,024.4
Outstanding Borrowings	524.4
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Expiration Date	Sep. 01, 2016
Unused Available Capacity	$ 500.0
Term Loan Facility [Member]
Line of Credit Facility [Line Items]
Expiration Date	Sep. 01, 2016