CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 594.7	$ 695.9
Adjustments to reconcile net income to cash provided by operating activities
Depreciation, amortization and accretion	896.0	817.5
Stock-based compensation expense	67.5	62.0
Loss on early retirement of long-term obligations	0.0	55.7
Other non-cash items reflected in statements of operations	206.0	(50.2)
Increase in net deferred rent balances	(10.7)	(71.5)
Increase in assets	(68.9)	(102.0)
Increase in liabilities	47.2	65.4
Cash provided by operating activities	1,731.8	1,472.8
CASH FLOWS FROM INVESTING ACTIVITIES
Payments for purchase of property and equipment and construction activities	(424.9)	(371.5)
Payments for acquisitions, net of cash acquired	(1,336.5)	(857.2)
Proceeds from sale of short-term investments and other non-current assets	894.5	7.2
Payments for short-term investments	(952.8)	0.0
Deposits and other	(23.3)	7.0
Cash used for investing activities	(1,843.0)	(1,214.5)
CASH FLOWS FROM FINANCING ACTIVITIES
Borrowings under credit facilities	2,663.3	2,508.6
Proceeds from issuance of senior notes, net	584.9	1,279.4
Proceeds from term loan	1,500.0	0.0
Proceeds from issuance of securities in securitization transaction	500.0	0.0
Repayments of notes payable, credit facilities, senior notes, secured debt and capital leases	(4,257.4)	(3,126.7)
(Distributions to) contributions from noncontrolling interest holders, net	(13.9)	265.3
Purchases of common stock	(98.6)	(641.4)
Proceeds from stock options and ESPP	40.2	82.6
Distributions paid on common stock	(635.6)	(514.9)
Distributions paid on preferred stock	(18.9)	(53.6)
Payment for early retirement of long-term obligations	0.0	(61.8)
Deferred financing costs and other financing activities	(55.1)	(28.1)
Purchase of noncontrolling interest	(20.5)	0.0
Cash provided by (used for) financing activities	188.4	(290.6)
Net effect of changes in foreign currency exchange rates on cash and cash equivalents, and restricted cash	(62.0)	9.1
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH	15.2	(23.2)
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF PERIOD	954.9	936.5
CASH AND CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	970.1	913.3
CASH PAID FOR INCOME TAXES (NET OF REFUNDS OF $23.7 AND $17.3, RESPECTIVELY)	44.6	60.4
CASH PAID FOR INTEREST	382.5	352.0
NON-CASH INVESTING AND FINANCING ACTIVITIES:
(Decrease) increase in accounts payable and accrued expenses for purchases of property and equipment and construction activities	(44.2)	8.7
Purchases of property and equipment under capital leases	$ 26.5	$ 22.0