ACCUMULATED OTHER COMPREHENSIVE LOSS - Activity for Each Component of Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021
AOCI Attributable to Parent, Net of Tax
Beginning balance	$ 5,943.6	$ 5,844.9	$ 5,835.9	$ 5,133.3	$ 4,658.4	$ 4,574.3
Other comprehensive (loss) gain before reclassifications	8.2	0.4	(30.3)	0.9	8.3	(1.2)
Amounts reclassified from accumulated other comprehensive loss	(28.7)	(13.2)	(4.1)	10.6	6.8	(1.6)
Deferred income tax (expense) benefit	(11.1)	(25.0)	5.5	(7.3)	(2.3)	(8.5)
Ending balance	6,217.8	5,943.6	5,844.9	5,541.3	5,133.3	4,658.4
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax
Beginning balance	(225.7)	(182.5)	(172.5)	(144.1)	(154.6)	(122.4)
Other comprehensive (loss) gain before reclassifications	(35.7)	(36.5)	(7.4)	(9.0)	12.9	(30.2)
Amounts reclassified from accumulated other comprehensive loss	(1.8)	(2.0)	(1.6)	(1.6)	(1.5)	(1.6)
Deferred income tax (expense) benefit	(4.2)	(4.7)	(1.0)	(1.6)	(0.9)	(0.4)
Ending balance	(267.4)	(225.7)	(182.5)	(156.3)	(144.1)	(154.6)
Unrealized Gain on Hedges
AOCI Attributable to Parent, Net of Tax
Beginning balance	74.4	43.1	29.7	(0.8)	(3.2)	(27.7)
Other comprehensive (loss) gain before reclassifications	59.2	57.9	24.7	14.5	(3.4)	34.8
Amounts reclassified from accumulated other comprehensive loss	(31.6)	(16.3)	(7.3)	10.1	7.2	(0.9)
Deferred income tax (expense) benefit	(7.0)	(10.3)	(4.0)	(6.3)	(1.4)	(9.4)
Ending balance	95.0	74.4	43.1	17.5	(0.8)	(3.2)
Unrealized Loss on Available-for-sale Investments
AOCI Attributable to Parent, Net of Tax
Beginning balance	(65.0)	(39.2)	(6.9)	4.8	4.7	8.6
Other comprehensive (loss) gain before reclassifications	(15.1)	(20.9)	(47.6)	(4.5)	(1.0)	(6.1)
Amounts reclassified from accumulated other comprehensive loss	4.7	5.1	4.8	2.1	1.1	0.9
Deferred income tax (expense) benefit	0.0	(10.0)	10.5	0.6	0.0	1.3
Ending balance	(75.4)	(65.0)	(39.2)	3.0	4.8	4.7
Unrealized Pension Costs
AOCI Attributable to Parent, Net of Tax
Beginning balance	(8.1)	(8.0)	(8.0)	(19.5)	(19.3)	(19.6)
Other comprehensive (loss) gain before reclassifications	(0.2)	(0.1)	0.0	(0.1)	(0.2)	0.3
Amounts reclassified from accumulated other comprehensive loss	0.0	0.0	0.0	0.0	0.0	0.0
Deferred income tax (expense) benefit	0.1	0.0	0.0	0.0	0.0	0.0
Ending balance	(8.2)	(8.1)	(8.0)	(19.6)	(19.5)	(19.3)
Accumulated Other Comprehensive Loss
AOCI Attributable to Parent, Net of Tax
Beginning balance	(224.4)	(186.6)	(157.7)	(159.6)	(172.4)	(161.1)
Ending balance	$ (256.0)	$ (224.4)	$ (186.6)	$ (155.4)	$ (159.6)	$ (172.4)

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount before tax and reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Amount of tax expense (benefit) allocated to other comprehensive income (loss) attributable to parent entity.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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