CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 1,916.6	$ 1,264.7	$ 1,225.4
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation, amortization and accretion	1,778.4	2,110.8	1,715.9
Stock-based compensation expense	111.4	137.5	108.5
Loss (gain) on investments, unrealized foreign currency loss and other non-cash expense	46.2	47.3	(18.0)
Impairments, net loss on sale of long-lived assets, non-cash restructuring and merger related expenses	140.0	479.6	242.4
Loss on early retirement of long-term obligations	22.2	3.3	70.2
Amortization of deferred financing costs, debt discounts and premiums and other non-cash interest	25.9	22.1	20.0
Deferred income taxes	(55.1)	(303.0)	(86.6)
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	12.5	(32.1)	(191.1)
Prepaid and other assets	(67.6)	(101.7)	(179.9)
Deferred rent asset	(183.5)	(87.6)	(194.4)
Right-of-use asset and Operating lease liability, net	17.4
Accounts payable and accrued expenses	(46.8)	69.3	95.8
Accrued interest	32.4	8.4	9.2
Unearned revenue	2.5	85.8	59.3
Deferred rent liability	0.0	57.9	62.3
Other non-current liabilities	0.1	(14.0)	(13.4)
Cash provided by operating activities	3,752.6	3,748.3	2,925.6
CASH FLOWS FROM INVESTING ACTIVITIES
Payments for purchase of property and equipment and construction activities	(991.3)	(913.2)	(803.6)
Payments for acquisitions, net of cash acquired	(2,959.6)	(1,881.4)	(2,007.0)
Proceeds from sales of short-term investments and other non-current assets	383.5	1,252.2	14.7
Payments for short-term investments	(355.9)	(1,154.3)	0.0
Deposits and other	(64.2)	(52.8)	(5.0)
Cash used for investing activities	(3,987.5)	(2,749.5)	(2,800.9)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings under credit facilities	5,750.0	3,263.3	5,359.4
Proceeds from issuance of senior notes, net	4,876.7	584.9	2,674.0
Proceeds from term loan	1,300.0	1,500.0	0.0
Proceeds from issuance of securities in securitization transaction	0.0	500.0	0.0
Repayments of notes payable, credit facilities, term loan, senior notes, secured debt, finance leases and capital leases	(9,225.3)	(4,884.8)	(6,484.4)
Distributions to non-controlling interests holders	(11.8)	(14.4)
Contributions from noncontrolling interest holders			264.3
Purchases of common stock	(19.6)	(232.8)	(766.3)
Proceeds from stock options and employee stock purchase plan	105.5	98.9	119.7
Distributions paid on common stock	(1,603.0)	(1,323.5)	(1,073.0)
Distributions paid on preferred stock	0.0	(18.9)	(91.4)
Payment for early retirement of long-term obligations	(21.0)	(3.3)	(75.3)
Deferred financing costs and other financing activities	(135.6)	(56.6)	(40.0)
Purchase of redeemable noncontrolling interest	(425.7)	0.0	0.0
Purchase of noncontrolling interest	(68.5)	(20.5)	0.0
Cash provided by (used for) financing activities	521.7	(607.7)	(113.0)
Net effect of changes in foreign currency exchange rates on cash and cash equivalents, and restricted cash	(13.7)	(41.1)	6.7
NET INCREASE IN CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH	273.1	350.0	18.4
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF YEAR	1,304.9	954.9	936.5
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, END OF YEAR	$ 1,578.0	$ 1,304.9	$ 954.9