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Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
OPERATING ACTIVITIES
Net loss	$ (192.2)	$ (636.6)	$ (304.2)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities of continuing operations:
Bargain purchase gain	(637.0)	(1.8)	(140.2)
Depreciation expense	609.7	478.9	444.8
(Gain) loss on debt extinguishment	(194.1)	19.0	2.6
Loss on impairment	104.0	40.3	182.9
Share-based compensation expense	37.3	29.9	34.2
Amortization, net	(16.8)	(40.2)	(61.6)
Equity in earnings of ARO	12.6	0.0	0.0
Deferred income tax expense	23.9	56.6	55.0
Other	16.8	4.5	(26.5)
Changes in operating assets and liabilities, net of acquisition	(27.9)	(6.3)	72.4
Contributions to pension plans and other post-retirement benefits	(13.2)	0.0	0.0
Net cash provided by operating activities of continuing operations	(276.9)	(55.7)	259.4
INVESTING ACTIVITIES
Acquisition of Rowan, net of cash acquired	931.9	0.0	0.0
Maturities of short-term investments	474.0	1,030.0	2,042.5
Purchases of short-term investments	(145.0)	(919.0)	(1,040.0)
Additions to property and equipment	(227.0)	(426.7)	(536.7)
Net proceeds from disposition of assets	17.7	11.0	2.8
Acquisition of Atwood, net of cash acquired	0.0	0.0	(871.6)
Net cash used in investing activities of continuing operations	1,051.6	(304.7)	(403.0)
FINANCING ACTIVITIES
Reduction of long-term borrowings	(928.1)	(771.2)	(537.0)
Borrowings on credit facility	215.0	0.0	0.0
Repayments of credit facility borrowings	(215.0)	0.0	0.0
Debt solicitation fees	(9.5)	0.0	0.0
Cash dividends paid	(4.5)	(17.9)	(13.8)
Proceeds from issuance of senior notes	0.0	1,000.0	0.0
Debt issuance costs	0.0	(17.0)	(12.0)
Other	(10.2)	(5.7)	(7.7)
Net cash provided by (used in) financing activities	(952.3)	188.2	(570.5)
Net cash provided by (used in) discontinued operations	0.0	2.5	(0.8)
Effect of exchange rate changes on cash and cash equivalents	(0.3)	(0.6)	0.6
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	(177.9)	(170.3)	(714.3)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	275.1	445.4	1,159.7
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 97.2	$ 275.1	$ 445.4

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