Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjustment
Balance at Jun. 30, 2017	$ 1,003.8		$ 1.6	$ 987.6	$ 1,469.4		$ (1,398.9)	$ (55.8)
Balance (in shares) at Jun. 30, 2017			154.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	431.9				427.9			3.9
Stock option exercises and excess tax benefits	51.5			51.5
Stock-based compensation	54.7			54.7
Treasury stock acquired	(277.1)						(277.1)
Treasury stock reissued	0.0			(45.3)			45.3
Common stock dividends	(170.4)				(170.4)
Balance at Jun. 30, 2018	1,094.3	$ 101.3	$ 1.6	1,048.5	1,727.0	$ 102.8	(1,630.8)	(51.9)	$ (1.5)
Balance (in shares) at Jun. 30, 2018			154.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	464.3				482.1			(17.7)
Stock option exercises and excess tax benefits	31.3			31.3
Stock-based compensation	58.3			58.3
Treasury stock acquired	(397.8)						(397.8)
Treasury stock reissued	0.0			(28.8)			28.8
Common stock dividends	(224.2)				(224.2)
Balance at Jun. 30, 2019	$ 1,127.5	$ 0.2	$ 1.6	1,109.3	2,087.7	$ 0.2	(1,999.8)	(71.2)
Balance (in shares) at Jun. 30, 2019	154.5		154.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	$ 433.3				462.5			(29.2)
Stock option exercises and excess tax benefits	42.1			42.1
Stock-based compensation	60.6			60.6
Treasury stock acquired	(69.3)						(69.3)
Treasury stock reissued	0.0			(33.5)			33.5
Common stock dividends	(247.8)				(247.8)
Balance at Jun. 30, 2020	$ 1,346.5		$ 1.6	$ 1,178.5	$ 2,302.6		$ (2,035.7)	$ (100.4)
Balance (in shares) at Jun. 30, 2020	154.5		154.5