INCOME TAXES - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Contingency [Line Items]
Income tax expense (benefit)	$ 3.2	$ 37.0	$ 16.8	$ 28.9
Income tax expense, percentage of pre-tax income	0.60%	34.50%	1.70%	7.00%
Increase in unrecognized tax benefits		$ 36.8		$ 36.8
Excess tax benefits associated with employee equity plans	$ 43.6	$ 31.6	$ 117.0	$ 97.0
excess tax benefits associated with employee equity plans (in percent)	8.30%	29.40%	12.00%	23.30%
Swiss
Income Tax Contingency [Line Items]
Re-measurement of deferred tax assets	$ 66.4		$ 66.4

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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