Funds Held for Clients and Corporate Investments (Tables)

12 Months Ended

May 31, 2011

Funds Held for Clients and Corporate Investments (Tables) [Abstract]

Funds held for clients and corporate investments

	May 31, 2011
			Gross		Gross
	Amortized		unrealized		unrealized			Fair
In millions	cost		gains		losses			value
Type of issue:
Money market securities and other cash equivalents	$	1,372.9	$	—	$	—		$	1,372.9
Available-for-sale securities:
General obligation municipal bonds		1,017.5		33.1		(0.1	)		1,050.5
Pre-refunded municipal bonds(1)		470.5		14.2		—			484.7
Revenue municipal bonds		361.6		12.1		—			373.7
Variable rate demand notes		828.3		—		—			828.3
Total available-for-sale securities		2,677.9		59.4		(0.1	)		2,737.2
Other		8.3		0.6		—			8.9
Total funds held for clients and corporate investments	$	4,059.1	$	60.0	$	(0.1	)	$	4,119.0

	May 31, 2010
			Gross		Gross
	Amortized		unrealized		unrealized			Fair
In millions	cost		gains		losses			value
Type of issue:
Money market securities and other cash equivalents	$	1,754.5	$	—	$	—		$	1,754.5
Available-for-sale securities:
General obligation municipal bonds		951.1		33.7		(0.3	)		984.5
Pre-refunded municipal bonds(1)		539.8		19.5		—			559.3
Revenue municipal bonds		368.0		13.8		(0.1	)		381.7
Variable rate demand notes		226.3		—		—			226.3
Total available-for-sale securities		2,085.2		67.0		(0.4	)		2,151.8
Other		7.5		—		(0.2	)		7.3
Total funds held for clients and corporate investments	$	3,847.2	$	67.0	$	(0.6	)	$	3,913.6

(1) Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

Classification of investments on the Consolidated Balance Sheets

	May 31,
In millions	2011		2010
Funds held for clients	$	3,566.7	$	3,541.0
Corporate investments		345.0		82.5
Long-term corporate investments		207.3		290.1
Total funds held for clients and corporate investments	$	4,119.0	$	3,913.6

Securities in unrealized loss position

	May 31, 2011
	Less than					More than
	twelve months					twelve months				Total
	Gross					Gross				Gross
	unrealized			Fair		unrealized		Fair		unrealized			Fair
In millions	losses			value		losses		value		losses			value
Type of issue:
General obligation municipal bonds	$	(0.1	)	$	37.3	$	—	$	—	$	(0.1	)	$	37.3
Pre-refunded municipal bonds		—			—		—		—		—			—
Revenue municipal bonds		—			14.4		—		—		—			14.4
Total	$	(0.1	)	$	51.7	$	—	$	—	$	(0.1	)	$	51.7

	May 31, 2010
	Less than					More than
	twelve months					twelve months				Total
	Gross					Gross				Gross
	unrealized			Fair		unrealized		Fair		unrealized			Fair
In millions	losses			value		losses		value		losses			value
Type of issue:
General obligation municipal bonds	$	(0.3	)	$	44.0	$	—	$	—	$	(0.3	)	$	44.0
Pre-refunded municipal bonds		—			4.1		—		—		—			4.1
Revenue municipal bonds		(0.1	)		25.5		—		—		(0.1	)		25.5
Total	$	(0.4	)	$	73.6	$	—	$	—	$	(0.4	)	$	73.6

Realized gains and losses on the sales of available-for-sale securities

	Year ended May 31,
In millions	2011		2010		2009
Gross realized gains	$	1.3	$	3.2	$	1.2
Gross realized losses		—		—		(0.1	)
Net realized gains	$	1.3	$	3.2	$	1.1

Amortized cost and fair value of available-for-sale securities having contractual maturity

	May 31, 2011
	Amortized		Fair
In millions	cost		value
Maturity date:
Due in one year or less	$	408.7	$	412.3
Due after one year through three years		603.0		626.9
Due after three years through five years		570.8		592.7
Due after five years		1,095.4		1,105.3
Total	$	2,677.9	$	2,737.2