Other Income, Net (Other Income, Net) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Mar. 31, 2012	Mar. 31, 2011
Other Income, Net [Abstract]
Interest income on corporate funds	$ (8.5)		$ (10.0)	$ (65.3)	$ (68.8)
Realized gains on available-for-sale securities	(4.0)		(5.4)	(23.2)	(23.0)
Realized losses on available-for-sale securities	0.4		1.0	7.4	3.3
Realized gain on investment in Reserve Fund					(0.9)
Impairment losses on available-for-sale securities		5.8		5.8
Impairment losses on assets held for sale	2.2			2.2	8.6
Gain on sale of assets				(66.0)
Gains on sales of buildings					(1.8)
Other, net	(0.6)		(0.6)	(1.9)	(1.7)
Other income, net	$ (10.5)		$ (15.0)	$ (141.0)	$ (84.3)