Reclassification out of Accumulated Other Comprehensive Income "AOCI" (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Other comprehensive income (loss), net	$ (312.1)	$ (2,004.3)	$ 25.4
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive, beginning balance	3,225.3
Other comprehensive income/(loss) before reclassification adjustments	(426.6)	(2,585.2)	10.3
Tax effect	100.0	561.0	14.4
Reclassification adjustments to net earnings	18.7	26.9	1.8
Tax effect	(4.2)	(7.0)	(1.1)
Accumulated Other Comprehensive, ending balance	3,509.1	3,225.3
Accumulated Other Comprehensive (Loss) /Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive, beginning balance	(1,993.7)	10.6	(14.8)
Accumulated Other Comprehensive, ending balance	(2,305.8)	(1,993.7)	10.6
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive, beginning balance	(354.2)	(226.8)	(322.2)
Other comprehensive income/(loss) before reclassification adjustments	13.4	(127.4)	95.4
Tax effect	0.0	0.0	0.0
Reclassification adjustments to net earnings	0.0	0.0	0.0
Tax effect	0.0	0.0	0.0
Accumulated Other Comprehensive, ending balance	(340.8)	(354.2)	(226.8)
Net Gains/(Losses) on Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive, beginning balance	(1,330.0)	390.9	680.4
Other comprehensive income/(loss) before reclassification adjustments	(500.3)	(2,228.0)	(363.3)
Tax effect	113.3	503.7	82.6
Reclassification adjustments to net earnings	14.7	4.4	(11.3)
Tax effect	(3.3)	(1.0)	2.5
Accumulated Other Comprehensive, ending balance	(1,705.6)	(1,330.0)	390.9
Cash Flow Hedging Activities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive, beginning balance	(26.6)	(29.9)	(30.3)
Other comprehensive income/(loss) before reclassification adjustments	0.0	0.0	(3.3)
Tax effect	0.0	0.0	0.8
Reclassification adjustments to net earnings	4.4	4.4	3.8
Tax effect	(1.1)	(1.1)	(0.9)
Accumulated Other Comprehensive, ending balance	(23.3)	(26.6)	(29.9)
Pension Liability
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive, beginning balance	(282.9)	(123.6)	(342.7)
Other comprehensive income/(loss) before reclassification adjustments	60.3	(229.8)	281.5
Tax effect	(13.3)	57.3	(69.0)
Reclassification adjustments to net earnings	(0.4)	18.1	9.3
Tax effect	0.2	(4.9)	(2.7)
Accumulated Other Comprehensive, ending balance	$ (236.1)	$ (282.9)	$ (123.6)