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Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Jan. 31, 2020	Oct. 31, 2019	Jul. 31, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Jan. 31, 2020	Jan. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 187.4	$ 211.2	$ 154.6	$ 121.4	$ 188.5	$ 133.0	$ 553.2	$ 442.9
Less: Net income allocated to participating securities	1.1			0.6			3.2	2.3
Net income allocated to common stockholders	$ 186.3			$ 120.8			$ 550.0	$ 440.6
Weighted-average common shares outstanding (in shares)	113.4			113.2			113.3	113.1
Add: Dilutive effect of stock options (in shares)	0.0			0.0			0.0	0.0
Weighted-average common shares outstanding - assuming dilution (in shares)	113.4			113.2			113.3	113.1
Net income per common share (in dollars per share)	$ 1.64			$ 1.07			$ 4.85	$ 3.89
Net Income - Assuming Dilution (in dollars per share)	$ 1.64			$ 1.07			$ 4.85	$ 3.89

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