Corporate Investments And Funds Held For Clients (Corporate Investments And Funds Held For Clients) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014		Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Money market securities and other cash equivalents - Amortized Cost	$ 3,171.4		$ 5,431.2
Money market securities and other cash equivalents - Fair Value	3,171.4		5,431.2
Total available-for-sale securities - Amortized Cost	19,832.1		18,551.3
Total available-for-sale securities - Gross Unrealized Gains	362.5		418.5
Total available-for-sale securities - Gross Unrealized Losses	(38.1)		(131.1)
Total available-for-sale securities - Fair Value	20,156.5	[1]	18,838.7	[2]
Total corporate investments and funds held for clients - Amortized Cost	23,003.5		23,982.5
Total corporate investments and funds held for clients - Gross Unrealized Gains	362.5		418.5
Total corporate investments and funds held for clients - Gross Unrealized Losses	(38.1)		(131.1)
Total corporate investments and funds held for clients - Fair Value	23,327.9		24,269.9
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Amortized Cost	8,720.1		7,868.3
Total available-for-sale securities - Gross Unrealized Gains	171.1		166.2
Total available-for-sale securities - Gross Unrealized Losses	(15.0)		(56.7)
Total available-for-sale securities - Fair Value	8,876.2	[1]	7,977.8	[2]
U.S. Treasury And Direct Obligations Of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Amortized Cost	6,051.4		5,983.7
Total available-for-sale securities - Gross Unrealized Gains	107.3		152.6
Total available-for-sale securities - Gross Unrealized Losses	(11.7)		(37.4)
Total available-for-sale securities - Fair Value	6,147.0	[1]	6,098.9	[2]
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Amortized Cost	1,822.6		1,374.1
Total available-for-sale securities - Gross Unrealized Gains	6.1		5.3
Total available-for-sale securities - Gross Unrealized Losses	(6.9)		(19.7)
Total available-for-sale securities - Fair Value	1,821.8	[1]	1,359.7	[2]
Canadian Government Obligations And Canadian Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Amortized Cost	1,031.4		998.2
Total available-for-sale securities - Gross Unrealized Gains	7.6		10.7
Total available-for-sale securities - Gross Unrealized Losses	(0.8)		(4.5)
Total available-for-sale securities - Fair Value	1,038.2	[1]	1,004.4	[2]
Canadian Provincial Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Amortized Cost	747.7		695.7
Total available-for-sale securities - Gross Unrealized Gains	25.3		20.7
Total available-for-sale securities - Gross Unrealized Losses	(2.5)		(5.6)
Total available-for-sale securities - Fair Value	770.5	[1]	710.8	[2]
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Amortized Cost	543.3		536.9
Total available-for-sale securities - Gross Unrealized Gains	19.4		16.7
Total available-for-sale securities - Gross Unrealized Losses	(0.5)		(4.4)
Total available-for-sale securities - Fair Value	562.2	[1]	549.2	[2]
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Amortized Cost	915.6		1,094.4
Total available-for-sale securities - Gross Unrealized Gains	25.7		46.3
Total available-for-sale securities - Gross Unrealized Losses	(0.7)		(2.8)
Total available-for-sale securities - Fair Value	940.6	[1]	1,137.9	[2]
Corporate Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Fair Value	2,086.3		342.0
Funds Held For Clients [Member]
Schedule of Available-for-sale Securities [Line Items]
Total available-for-sale securities - Fair Value	$ 18,070.2		$ 18,496.7

[1] Included within available-for-sale securities are corporate investments with fair values of $2,086.3 million and funds held for clients with fair values of $18,070.2 million. All available-for-sale securities were included in Level 2.

[2] Included within available-for-sale securities are corporate investments with fair values of $342.0 million and funds held for clients with fair values of $18,496.7 million. At June 30, 2013 Level 1 securities included $9.5 million of corporate investments classified within "Other securities," all remaining available-for-sale securities were included in Level 2.