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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Nov. 30, 2011	Nov. 30, 2010	Nov. 30, 2011	Nov. 30, 2010	May 31, 2010
Income Taxes [Line Items]
Effective tax rate	27.50%	29.60%	30.20%	30.60%
Unrecognized tax benefits	$ 41.1		$ 41.1		$ 37.2
Additional liabilities for unrecognized income tax benefits	1.5		3.9
UNITED KINGDOM
Income Taxes [Line Items]
Effective income tax rate reconciliation, change in enacted tax rate			2.00%	1.00%
HSBC Merchant Services LLP [Member]
Income Taxes [Line Items]
Deferred tax asset - arising from acquisition of noncontrolling interest			$ 93.1
Remaining interest in the LLP	49.00%		49.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit that is attributable to changes in the income tax laws or rates.

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