CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows From Operating Activities
Net loss	$ (858.2)	$ (837.8)	$ (804.8)
Adjustments to reconcile net loss to net cash provided by operating activities:
Depreciation and amortization	295.4	369.7	387.8
Amortization of operating right-of-use assets	67.6	73.2	59.8
Deferred income taxes	(35.0)	(41.9)	(108.8)
Share-based compensation expense	63.4	65.4	69.5
Impairment of goodwill	714.9	708.8	534.5
Impairment of assets, net	20.0	52.2	146.1
Gain on debt extinguishment, net of debt modification costs	(147.2)	(271.3)	0.0
Unrealized loss on derivative contracts	0.0	15.5	18.5
(Gain) loss on investments, net	(0.1)	(0.3)	0.2
Provision for bad debts and accrued customer credits	19.5	9.0	12.4
Amortization of debt issuance costs and debt discount and premium	2.2	7.9	8.0
Third party fees paid in connection with the March 2024 Refinancing Transactions	(31.7)	0.0	0.0
Non-cash fair value adjustments	(2.2)	(1.0)	3.2
Other operating activities	(6.5)	0.4	(0.2)
Changes in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	20.5	275.1	(82.4)
Prepaid expenses and other current assets	10.5	24.6	(7.1)
Accounts payable, accrued expenses, and other current liabilities	(22.2)	(44.2)	69.8
Deferred revenue	2.4	(5.8)	(21.6)
Operating lease liabilities	(82.8)	(65.6)	(65.5)
Other non-current assets and liabilities	9.4	41.0	27.3
Net cash provided by operating activities	39.9	374.9	246.7
Cash Flows From Investing Activities
Purchases of property, equipment and software	(111.1)	(96.9)	(80.4)
Acquisitions, net of cash acquired	0.0	0.0	(7.7)
Proceeds from sale of headquarters	16.9	0.0	0.0
Purchase of convertible promissory note	0.0	0.0	(15.0)
Other investing activities	7.6	0.9	5.2
Net cash used in investing activities	(86.6)	(96.0)	(97.9)
Cash Flows From Financing Activities
Proceeds from employee stock plans	0.9	1.3	3.7
Shares of common stock withheld for employee taxes	(4.3)	(1.0)	0.0
Shares of common stock repurchased	0.0	0.0	(31.0)
Proceeds from borrowings under long-term debt arrangements	275.0	50.0	0.0
Payments on long-term debt	(163.0)	(241.9)	(23.0)
Debt extinguishment costs	(22.1)	0.0	0.0
Payments on financing component of interest rate swap	(17.3)	(18.8)	(17.2)
Principal payments of finance lease liabilities	(56.9)	(79.7)	(67.2)
Principal payments of financing obligations	(15.3)	(22.7)	(49.0)
Other financing activities	0.0	0.0	(3.3)
Net cash used in financing activities	(3.0)	(312.8)	(187.0)
Effect of exchange rate changes on cash, cash equivalents, and restricted cash	(3.0)	2.2	(5.8)
Decrease in cash, cash equivalents, and restricted cash	(52.7)	(31.7)	(44.0)
Cash, cash equivalents, and restricted cash at beginning of period	199.7	231.4	275.4
Cash, cash equivalents, and restricted cash at end of period	147.0	199.7	231.4
Supplemental Cash Flow Information
Cash payments for interest, net of amount capitalized	103.6	213.9	177.9
Cash payments for income taxes, net of refunds	10.8	11.9	10.5
Non-cash Investing and Financing Activities
Acquisition of property, equipment and software by finance leases	40.8	67.7	36.7
Acquisition of property, equipment and software by financing obligations	4.4	25.0	7.1
Increase (decrease) in property, equipment and software accrued in liabilities	(9.9)	(13.6)	17.6
Other non-cash activity	(10.0)	5.3	0.0
Non-cash purchases of property, equipment and software	25.3	84.4	61.4
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	144.0	196.8	228.4
Restricted cash included in other non-current assets	3.0	2.9	3.0
Total cash, cash equivalents, and restricted cash shown in the statement of cash flows	$ 147.0	$ 199.7	$ 231.4