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Income Taxes (Details 2) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
Current:      
Federal $ 277.9 $ 325.1 $ 342.5
Foreign 7.9 11.0 4.8
State and local 40.0 29.4 37.1
Deferred:      
Federal (802.3) (78.3) (32.1)
Foreign 0.5 1.6 1.3
State and local (1.6) (2.7) (64.4)
Total income tax expense (benefit) $ (477.6) $ 286.1 $ 289.2