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

12 Months Ended

May. 31, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Components of intangible assets, at cost

The components of intangible assets, at cost, consisted of the following:

	May 31,
In millions	2015		2014
Client lists	$	244.6	$	240.9
Other intangible assets	3.2		2.6
Total intangible assets, gross	247.8		243.5
Less: Accumulated amortization	215.4		202.9
Intangible assets, net of accumulated amortization	$	32.4	$	40.6

Estimated future amortization expense relating to intangible assets

The estimated amortization expense for the next five fiscal years relating to intangible asset balances is as follows:

In millions Year ending May 31,	Estimated amortization  expense
2016	$	11.3
2017	8.2
2018	5.5
2019	3.6
2020	2.0