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Income Taxes (Details 3) - USD ($)
$ in Millions
4 Months Ended 8 Months Ended 12 Months Ended
Apr. 30, 2018
Dec. 31, 2017
Apr. 30, 2018
Apr. 30, 2017
Apr. 30, 2016
(Percent of Pre-tax Income)          
Statutory federal income tax rate 21.00% 35.00% 30.40% 35.00% 35.00%
Tax reform – net impact on U.S. deferred tax assets and liabilities (provisional)     (92.00%) 0.00% 0.00%
Tax reform – transition tax (provisional)     3.00% 0.00% 0.00%
Goodwill impairment     5.50% 0.00% 0.00%
State and local income taxes     1.90% 2.10% 2.50%
Domestic manufacturing deduction     (3.00%) (3.70%) (3.50%)
Deferred tax benefit from integration     0.00% 0.00% (5.20%)
Other items – net     (1.30%) (0.80%) 0.80%
Effective income tax rate     (55.50%) 32.60% 29.60%
Income taxes paid     $ 336.8 $ 367.2 $ 290.5