Reclassifications out of Accumulated Other Comprehensive Income (“AOCI”) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 5,348.6	$ 3,472.8	$ 4,547.6	$ 3,509.1
Other comprehensive income/(loss) before reclassification adjustments	(524.8)	914.4	376.2	719.2
Tax effect	94.2	(194.9)	(100.5)	(164.8)
Reclassification adjustments to net earnings	2.7	4.0	5.1	8.1
Tax effect	(0.6)	(0.9)	(1.2)	(1.9)
Ending balance	5,078.1	4,319.6	5,078.1	4,319.6
Accumulated Other Comprehensive (Loss) /Income
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(1,100.2)	(2,467.8)	(1,808.3)	(2,305.8)
Ending balance	(1,528.7)	(1,745.2)	(1,528.7)	(1,745.2)
Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(329.6)	(385.4)	(378.8)	(340.8)
Other comprehensive income/(loss) before reclassification adjustments	(101.0)	53.9	(51.8)	9.3
Tax effect	0.0	0.0	0.0	0.0
Reclassification adjustments to net earnings	0.0	0.0	0.0	0.0
Tax effect	0.0	0.0	0.0	0.0
Ending balance	(430.6)	(331.5)	(430.6)	(331.5)
Net Gains/Losses on Available-for-sale Securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(511.3)	(1,824.6)	(1,178.0)	(1,705.6)
Other comprehensive income/(loss) before reclassification adjustments	(423.8)	860.5	440.5	709.9
Tax effect	94.2	(194.9)	(103.6)	(164.8)
Reclassification adjustments to net earnings	0.6	2.0	0.8	4.0
Tax effect	(0.1)	(0.5)	(0.1)	(1.0)
Ending balance	(840.4)	(1,157.5)	(840.4)	(1,157.5)
Cash Flow Hedging Activities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(28.6)	(22.5)	(20.0)	(23.3)
Other comprehensive income/(loss) before reclassification adjustments	0.0	0.0	(12.5)	0.0
Tax effect	0.0	0.0	3.1	0.0
Reclassification adjustments to net earnings	1.4	1.1	2.5	2.2
Tax effect	(0.3)	(0.2)	(0.6)	(0.5)
Ending balance	(27.5)	(21.6)	(27.5)	(21.6)
Pension Liability
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(230.7)	(235.3)	(231.5)	(236.1)
Other comprehensive income/(loss) before reclassification adjustments	0.0	0.0	0.0	0.0
Tax effect	0.0	0.0	0.0	0.0
Reclassification adjustments to net earnings	0.7	0.9	1.8	1.9
Tax effect	(0.2)	(0.2)	(0.5)	(0.4)
Ending balance	$ (230.2)	$ (234.6)	$ (230.2)	$ (234.6)