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Income Taxes (Details) (USD $) In Millions, unless otherwise specified | May 31, 2013 | May 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Compensation and employee benefit liabilities | $ 16.3 | $ 15.8
Other current liabilities | 6.3 | 6.7
Tax credit carry forward | 35.3 | 31.7
Depreciation | 8.5 | 8.0
Stock-based compensation | 24.6 | 28.5
Other | 16.6 | 17.4
Gross deferred tax assets | 107.6 | 108.1
Deferred tax liabilities: |  |
Capitalized software | 45.8 | 39.3
Depreciation | 20.2 | 21.8
Intangible assets | 41.0 | 36.8
Revenue not subject to current taxes | 11.7 | 11.1
Unrealized gains on available-for-sale securities | 13.3 | 21.8
Other | 0.6 | 1.0
Gross deferred tax liabilities | 132.6 | 131.8
Net deferred tax liability | $ (25.0) | $ (23.7)

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