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Shareholders' Equity - Changes in Ordinary and Treasury Shares (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Beginning Balance	$ 5,402.9	$ 626.8	$ 5,674.7	$ 695.4
Settlement of forward contracts to purchase own equity to meet share-based incentive plans, net of tax				0.0
Purchase of treasury shares		(11.0)	(11.3)	(32.2)
Issuance of treasury shares under dividend reinvestment plan				13.0
Share buy-back/cancellations	(255.6)		(478.2)
Ending Balance	4,802.8	503.3	$ 4,802.8	$ 503.3
Ordinary Shares
Beginning Balance			1,625.9	1,158.1
Beginning Balance	16.1	$ 0.0	$ 16.3	$ 0.0
Share buy-back/cancellations			(51.5)
Share buy-back/cancellations	$ (0.3)		$ (0.5)
Ending Balance	1,574.4	1,158.1	1,574.4	1,158.1
Ending Balance	$ 15.8	$ 0.0	$ 15.8	$ 0.0
Treasury Shares
Beginning Balance			1.4	0.9
Beginning Balance	$ (11.4)	(12.2)	$ (16.1)	$ (10.7)
Options exercised and shares vested			(1.4)	(3.7)
Options exercised and shares vested			$ 16.0	$ 37.5
Settlement of forward contracts to purchase own equity to meet share base incentive plans, net of tax				2.5
Settlement of forward contracts to purchase own equity to meet share-based incentive plans, net of tax				$ (25.1)
Purchase of treasury shares			1.1	3.1
Purchase of treasury shares		$ (11.0)	$ (11.3)	$ (32.2)
Issuance of treasury shares under dividend reinvestment plan				(1.3)
Issuance of treasury shares under dividend reinvestment plan				$ 13.0
Ending Balance	1.1	1.5	1.1	1.5
Ending Balance	$ (11.4)	$ (17.5)	$ (11.4)	$ (17.5)

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