ACCUMULATED OTHER COMPREHENSIVE LOSS - Activity for Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax
Beginning balance	$ 5,844.9	$ 5,835.9	$ 4,658.4	$ 4,574.3
Other comprehensive (loss) gain before reclassifications	0.4	(30.3)	8.3	(1.2)
Amounts reclassified from accumulated other comprehensive loss	(13.2)	(4.1)	6.8	(1.6)
Deferred income tax (expense) benefit	(25.0)	5.5	(2.3)	(8.5)
Ending balance	5,943.6	5,844.9	5,133.3	4,658.4
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax
Beginning balance	(182.5)	(172.5)	(154.6)	(122.4)
Other comprehensive (loss) gain before reclassifications	(36.5)	(7.4)	12.9	(30.2)
Amounts reclassified from accumulated other comprehensive loss	(2.0)	(1.6)	(1.5)	(1.6)
Deferred income tax (expense) benefit	(4.7)	(1.0)	(0.9)	(0.4)
Ending balance	(225.7)	(182.5)	(144.1)	(154.6)
Unrealized Gain on Hedges
AOCI Attributable to Parent, Net of Tax
Beginning balance	43.1	29.7	(3.2)	(27.7)
Other comprehensive (loss) gain before reclassifications	57.9	24.7	(3.4)	34.8
Amounts reclassified from accumulated other comprehensive loss	(16.3)	(7.3)	7.2	(0.9)
Deferred income tax (expense) benefit	(10.3)	(4.0)	(1.4)	(9.4)
Ending balance	74.4	43.1	(0.8)	(3.2)
Unrealized Loss on Available-for-sale Investments
AOCI Attributable to Parent, Net of Tax
Beginning balance	(39.2)	(6.9)	4.7	8.6
Other comprehensive (loss) gain before reclassifications	(20.9)	(47.6)	(1.0)	(6.1)
Amounts reclassified from accumulated other comprehensive loss	5.1	4.8	1.1	0.9
Deferred income tax (expense) benefit	(10.0)	10.5	0.0	1.3
Ending balance	(65.0)	(39.2)	4.8	4.7
Unrealized Pension Costs
AOCI Attributable to Parent, Net of Tax
Beginning balance	(8.0)	(8.0)	(19.3)	(19.6)
Other comprehensive (loss) gain before reclassifications	(0.1)	0.0	(0.2)	0.3
Amounts reclassified from accumulated other comprehensive loss	0.0	0.0	0.0	0.0
Deferred income tax (expense) benefit	0.0	0.0	0.0	0.0
Ending balance	(8.1)	(8.0)	(19.5)	(19.3)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(186.6)	(157.7)	(172.4)	(161.1)
Ending balance	$ (224.4)	$ (186.6)	$ (159.6)	$ (172.4)

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