EQUITY AND CONVERTIBLE PREFERRED STOCK - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	$ 3,228.8	$ 4,593.4
Other comprehensive income (loss) before reclassifications	24.9	(416.6)
Net amounts reclassified from AOCI/(L)	5.3	(3.1)
Net current-period other comprehensive income (loss)	30.2	(419.7)
Balance, end of period	3,170.5	3,961.1
Total
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	(456.2)	(58.8)
Balance, end of period	(426.0)	(478.5)
(Loss) gain on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	(43.0)	(13.3)
Other comprehensive income (loss) before reclassifications	2.8	(31.4)
Net amounts reclassified from AOCI/(L)	20.4	1.5
Net current-period other comprehensive income (loss)	23.2	(29.9)
Balance, end of period	(19.8)	(43.2)
Gain (loss) on Net Investment Hedge
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	261.9	214.8
Other comprehensive income (loss) before reclassifications	(228.7)	121.7
Net amounts reclassified from AOCI/(L)	0.0	0.0
Net current-period other comprehensive income (loss)	(228.7)	121.7
Balance, end of period	33.2	336.5
Other Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	(683.8)	(257.4)
Other comprehensive income (loss) before reclassifications	250.8	(506.9)
Net amounts reclassified from AOCI/(L)	0.0	0.0
Net current-period other comprehensive income (loss)	250.8	(506.9)
Balance, end of period	(433.0)	(764.3)
Pension and Other Post-Employment Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning of period	8.7	(2.9)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Net amounts reclassified from AOCI/(L)	(15.1)	(4.6)
Net current-period other comprehensive income (loss)	(15.1)	(4.6)
Balance, end of period	(6.4)	$ (7.5)
Reclassification from accumulated other comprehensive income (loss), current period, before tax	15.1
Other comprehensive income (loss), tax	$ 4.5