Goodwill and Intangible Assets, Net of Accumulated Amortization (Tables)

12 Months Ended

May 31, 2011

Goodwill and Intangible Assets, Net of Accumulated Amortization (Tables) [Abstract]

Components of intangible assets, at cost

	May 31,
In millions	2011		2010
Client lists	$	223.4	$	194.4
Other intangible assets		2.0		1.1
Total intangible assets, gross		225.4		195.5
Less: Accumulated amortization		148.2		133.9
Intangible assets, net of accumulated amortization	$	77.2	$	61.6

Estimated future amortization expense relating to intangible asset balances

In millions
Year ending May 31,	Estimated amortization expense
2012	$	22.9
2013	$	17.7
2014	$	12.7
2015	$	9.0
2016	$	6.2