BASIS OF PRESENTATION - Net increase (decrease) in cash equivalents and restricted (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Cash flows from operating activities:
Net cash used in operating activities	$ (76.6)	$ (295.0)	$ 46.5	$ (113.9)	$ (233.8)	$ (312.9)	$ (371.6)	$ (546.7)	$ (614.1)
Cash flows from investing activities:
Net cash used in investing activities	(48.0)	(54.9)	(36.9)	(28.8)	13.5	(16.0)	(102.9)	(2.5)	(68.2)
Cash flows from financing activities:
Net cash provided by (used in) financing activities	(59.7)	(76.3)	(27.9)	(48.3)	1,212.2	854.7	(136.0)	2,066.9	1,990.7
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(16.4)	(5.5)	(1.6)	(8.4)	5.6	(5.1)	(21.9)	0.5	(9.5)
Net increase (decrease) in cash and cash equivalents and restricted cash	(200.7)	(431.7)	(19.9)	(199.4)	997.5	520.7	(632.4)	1,518.2	1,298.9
Cash and cash equivalents and restricted cash at beginning of period	1,188.6	1,620.3	1,640.2	1,839.6	842.1	321.4	1,620.3	321.4	321.4
Cash and cash equivalents and restricted cash at end of period	$ 987.9	$ 1,188.6	$ 1,620.3	$ 1,640.2	$ 1,839.6	$ 842.1	$ 987.9	$ 1,839.6	$ 1,620.3

Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of increase (decrease) from effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies. Excludes amounts for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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