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Income Taxes (Details 5) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Reconciliation of unrecognized tax benefits |  |  |
Balance at May 1, | $ 29.1 | $ 29.7 | $ 24.0
Increases: |  |  |
Current year tax positions | 2.4 | 5.1 | 4.8
Prior year tax positions | 1.2 | 0.1 | 2.5
Acquired businesses | 13.4 | 0.0 | 0.0
Decreases: |  |  |
Prior year tax positions | 0.4 | 1.6 | 0.2
Settlement with tax authorities | 0.0 | 1.5 | 1.0
Expiration of statute of limitations periods | 0.7 | 2.7 | 0.4
Balance at April 30, | $ 45.0 | $ 29.1 | $ 29.7

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