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	9 Months Ended	12 Months Ended
	Mar. 31, 2014	Jun. 30, 2013
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	$ (73.7)	$ (131.1)
Fair market value of securities in unrealized loss position less than 12 months	5,251.8	6,142.0
Unrealized losses greater than 12 months	(9.8)
Fair market value of securities in unrealized loss positions greater than 12 months	330.5
Total available for sale securities - Unrealized Loss	(83.5)	(131.1)
Total fair market value of securities in unrealized loss position	5,582.3	6,142.0
Corporate Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(33.3)	(56.7)
Fair market value of securities in unrealized loss position less than 12 months	2,193.2	2,724.9
Unrealized losses greater than 12 months	(2.0)
Fair market value of securities in unrealized loss positions greater than 12 months	56.8
Total available for sale securities - Unrealized Loss	(35.3)	(56.7)
Total fair market value of securities in unrealized loss position	2,250.0	2,724.9
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(20.7)	(37.4)
Fair market value of securities in unrealized loss position less than 12 months	1,357.3	1,374.6
Unrealized losses greater than 12 months	(5.5)
Fair market value of securities in unrealized loss positions greater than 12 months	218.0
Total available for sale securities - Unrealized Loss	(26.2)	(37.4)
Total fair market value of securities in unrealized loss position	1,575.3	1,374.6
Asset-Backed Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(12.0)	(19.7)
Fair market value of securities in unrealized loss position less than 12 months	1,031.1	1,060.1
Unrealized losses greater than 12 months	(1.1)
Fair market value of securities in unrealized loss positions greater than 12 months	28.4
Total available for sale securities - Unrealized Loss	(13.1)	(19.7)
Total fair market value of securities in unrealized loss position	1,059.5	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	(1.5)	(4.5)
Fair market value of securities in unrealized loss position less than 12 months	245.7	444.7
Unrealized losses greater than 12 months	0
Fair market value of securities in unrealized loss positions greater than 12 months	0
Total available for sale securities - Unrealized Loss	(1.5)	(4.5)
Total fair market value of securities in unrealized loss position	245.7	444.7
Canadian Provincial Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(3.3)	(5.6)
Fair market value of securities in unrealized loss position less than 12 months	197.6	239.7
Unrealized losses greater than 12 months	(0.7)
Fair market value of securities in unrealized loss positions greater than 12 months	14.4
Total available for sale securities - Unrealized Loss	(4.0)	(5.6)
Total fair market value of securities in unrealized loss position	212.0	239.7
Municipal Bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(1.0)	(4.4)
Fair market value of securities in unrealized loss position less than 12 months	95.0	188.7
Unrealized losses greater than 12 months	(0.4)
Fair market value of securities in unrealized loss positions greater than 12 months	11.2
Total available for sale securities - Unrealized Loss	(1.4)	(4.4)
Total fair market value of securities in unrealized loss position	106.2	188.7
Other Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses less than 12 months	(1.9)	(2.8)
Fair market value of securities in unrealized loss position less than 12 months	131.9	109.3
Unrealized losses greater than 12 months	(0.1)
Fair market value of securities in unrealized loss positions greater than 12 months	1.7
Total available for sale securities - Unrealized Loss	(2.0)	(2.8)
Total fair market value of securities in unrealized loss position	$ 133.6	$ 109.3