CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (567.2)	$ (2,176.3)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	114.1	122.5
Deferred income taxes	(6.2)	71.2
Impairment of long-lived assets, definite and indefinite-lived intangible assets and goodwill		1,851.9
Amortization of net premium on corporate borrowings to interest expense	42.3	3.1
Amortization of deferred financing costs to interest expense	12.1	4.1
PIK interest expense	52.7
Non-cash portion of stock-based compensation	5.4	2.7
Gain on dispositions		(1.0)
Loss on derivative asset and derivative liability		19.6
Equity in loss from non-consolidated entities, net of distributions	2.8	11.2
Landlord contributions	3.7	16.1
Other non-cash rent expense (benefit)	(7.5)	2.3
Deferred rent	(21.8)	(18.3)
Net periodic benefit cost	(0.2)	0.3
Change in assets and liabilities:
Receivables	(2.7)	129.4
Other assets	(13.0)	29.2
Accounts payable	(11.9)	(169.8)
Accrued expenses and other liabilities	96.4	(105.7)
Other, net	(11.9)	23.5
Net cash used in operating activities	(312.9)	(184.0)
Cash flows from investing activities:
Capital expenditures	(11.9)	(91.7)
Proceeds from disposition of long-term assets	5.2	3.4
Investments in non-consolidated entities, net	(9.3)
Other, net		0.9
Net cash used in investing activities	(16.0)	(87.4)
Cash flows from financing activities:
Borrowings (repayments) under revolving credit facilities	(335.0)	325.1
Scheduled principal payments under Term Loan due 2026	(5.0)	(5.0)
Payments related to sale of noncontrolling interest	(0.3)
Principal payments under finance lease obligations	(1.9)	(2.3)
Cash used to pay for deferred financing costs	(19.0)	(0.1)
Cash used to pay dividends		(4.3)
Taxes paid for restricted unit withholdings		(1.0)
Net cash provided by financing activities	854.7	312.4
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(5.1)	(6.7)
Net increase in cash and cash equivalents and restricted cash	520.7	34.3
Cash and cash equivalents and restricted cash at beginning of period	321.4	275.5	$ 275.5
Cash and cash equivalents and restricted cash at end of period	842.1	309.8	$ 321.4
Cash paid during the period for:
Interest (including amounts capitalized of $0.2 million and $0.3 million)	26.2	34.6
Income taxes (received) paid, net	(9.0)	1.7
Schedule of non-cash activities:
Investment in NCM	5.8	4.5
Construction payables at period end	10.0	$ 58.4
Class A common stock
Cash flows from financing activities:
Proceeds from Class A common stock issuance	581.6
First Lien Toggle Notes due 2026
Cash flows from financing activities:
Proceeds from First Lien Toggle Notes due 2026	100.0
Odeon
Cash flows from financing activities:
Proceeds from issuance of Odeon Term Loan due 2023	$ 534.3