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Reportable Segments (Details 1) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Geographical information [Line Items]        
Net sales $ 1,972.3 $ 2,011.9 $ 5,709.0 $ 5,935.9
United States        
Geographical information [Line Items]        
Net sales 1,837.6 1,880.6 5,311.1 5,526.1
Canada        
Geographical information [Line Items]        
Net sales 108.7 106.7 318.9 319.2
All Other International [Member]        
Geographical information [Line Items]        
Net sales 26.0 24.6 79.0 90.6
International [Member]        
Geographical information [Line Items]        
Net sales $ 134.7 $ 131.3 $ 397.9 $ 409.8