Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Net sales:
Net sales		$ 2,021.5	$ 1,923.6	$ 3,924.0	$ 3,672.5
Segment profit:
Segment profit		489.2	460.1	878.1	831.4
Amortization		(59.7)	(51.6)	(120.2)	(103.1)
Interest expense – net		(53.6)	(41.6)	(107.2)	(83.6)
Unallocated derivative gains (losses)		(0.1)	9.7	(22.1)	22.3
Cost of products sold – special project costs (A)	[1]	0.0	(0.9)	0.0	(1.6)
Other special project costs (A)	[1],[2]	(25.4)	(9.7)	(33.1)	(36.8)
Corporate administrative expenses		(73.5)	(75.5)	(145.3)	(144.9)
Other income (expense) – net		(7.5)	1.3	(7.7)	(2.9)
Income Before Income Taxes		269.4	291.8	442.5	480.8
U.S. Retail Coffee [Member]
Net sales:
Net sales		544.9	551.4	1,034.4	1,030.8
Segment profit:
Segment profit		174.3	152.1	322.1	275.3
U.S. Retail Consumer Foods [Member]
Net sales:
Net sales		461.9	527.8	945.2	1,015.7
Segment profit:
Segment profit		134.3	130.2	231.6	240.3
U.S. Retail Pet Foods [Member]
Net sales:
Net sales		728.1	551.1	1,399.3	1,071.8
Segment profit:
Segment profit		123.9	122.4	224.3	220.2
International and Away From Home [Member]
Net sales:
Net sales		286.6	293.3	545.1	554.2
Segment profit:
Segment profit		$ 56.7	$ 55.4	$ 100.1	$ 95.6

[1] Special project costs includes integration and restructuring costs. For more information, see Note 5: Integration and Restructuring Costs.

[2] Other special project costs includes integration and restructuring costs. For more information, see Note 5: Integration and Restructuring Costs.