Corporate Investments And Funds Held For Clients (Available-For-Sale Securities That Have Been In An Unrealized Loss Position) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	$ (3.7)	$ (131.1)
Fair market value of securities in unrealized loss position less than 12 months	982.1	6,142.0
Unrealized losses greater than 12 months	(34.4)	0
Fair market value of securities in unrealized loss positions greater than 12 months	2,713.2	0
Total Gross Unrealized Losses	(38.1)	(131.1)
Total fair market value of securities in unrealized loss position	3,695.3	6,142.0
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(0.9)	(56.7)
Fair market value of securities in unrealized loss position less than 12 months	313.8	2,724.9
Unrealized losses greater than 12 months	(14.1)	0
Fair market value of securities in unrealized loss positions greater than 12 months	1,026.0	0
Total Gross Unrealized Losses	(15.0)	(56.7)
Total fair market value of securities in unrealized loss position	1,339.8	2,724.9
U.S. Treasury And Direct Obligations Of U.S. Government Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(0.3)	(37.4)
Fair market value of securities in unrealized loss position less than 12 months	84.6	1,374.6
Unrealized losses greater than 12 months	(11.4)	0
Fair market value of securities in unrealized loss positions greater than 12 months	944.8	0
Total Gross Unrealized Losses	(11.7)	(37.4)
Total fair market value of securities in unrealized loss position	1,029.4	1,374.6
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(0.7)	(19.7)
Fair market value of securities in unrealized loss position less than 12 months	325.4	1,060.1
Unrealized losses greater than 12 months	(6.2)	0
Fair market value of securities in unrealized loss positions greater than 12 months	555.5	0
Total Gross Unrealized Losses	(6.9)	(19.7)
Total fair market value of securities in unrealized loss position	880.9	1,060.1
Canadian Government Obligations And Canadian Government Agency Obligations [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(0.8)	(4.5)
Fair market value of securities in unrealized loss position less than 12 months	127.2	444.7
Unrealized losses greater than 12 months	0	0
Fair market value of securities in unrealized loss positions greater than 12 months	0	0
Total Gross Unrealized Losses	(0.8)	(4.5)
Total fair market value of securities in unrealized loss position	127.2	444.7
Canadian Provincial Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(0.9)	(5.6)
Fair market value of securities in unrealized loss position less than 12 months	75.2	239.7
Unrealized losses greater than 12 months	(1.6)	0
Fair market value of securities in unrealized loss positions greater than 12 months	118.6	0
Total Gross Unrealized Losses	(2.5)	(5.6)
Total fair market value of securities in unrealized loss position	193.8	239.7
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(0.1)	(4.4)
Fair market value of securities in unrealized loss position less than 12 months	42.0	188.7
Unrealized losses greater than 12 months	(0.4)	0
Fair market value of securities in unrealized loss positions greater than 12 months	22.6	0
Total Gross Unrealized Losses	(0.5)	(4.4)
Total fair market value of securities in unrealized loss position	64.6	188.7
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	0	(2.8)
Fair market value of securities in unrealized loss position less than 12 months	13.9	109.3
Unrealized losses greater than 12 months	(0.7)	0
Fair market value of securities in unrealized loss positions greater than 12 months	45.7	0
Total Gross Unrealized Losses	(0.7)	(2.8)
Total fair market value of securities in unrealized loss position	$ 59.6	$ 109.3