Credit Arrangements (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2014
Credit agreement capacity	$ 25.0
Interest rate over LIBOR	1.1565%
Interest rate under prime rate	1.25%
Line of Credit Facility, Amount Outstanding	8.0
Assets Held-in-trust	3.8
Letters Of Credit [Member]
Credit agreement capacity	4.0
Line of Credit Facility, Amount Outstanding	2.9
Line of Credit Facility, Remaining Borrowing Capacity	14.1
Unsecured [Member]
Credit agreement capacity	8.0
Line of Credit Facility, Amount Outstanding	$ 4.0