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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
OPERATING ACTIVITIES      
Net income (loss) $ (304.2) $ 897.1 $ (1,585.9)
Adjustments to reconcile net income (loss) to net cash provided by operating activities of continuing operations:      
Depreciation expense 444.8 445.3 572.5
Loss on impairment 182.9 0.0 2,746.4
Bargain purchase gain (140.2) 0.0 0.0
Amortization (61.6) (139.7) (165.0)
Deferred income tax expense (benefit) 55.0 28.7 (158.0)
Share-based compensation expense 41.2 39.6 40.2
(Gain) loss on debt extinguishment 2.6 (287.8) 33.5
Discontinued operations, net (1.0) (8.1) 128.6
Other (25.5) (38.3) (27.9)
Changes in operating assets and liabilities, net of acquisition 65.4 140.6 113.5
Net cash provided by operating activities of continuing operations 259.4 1,077.4 1,697.9
INVESTING ACTIVITIES      
Maturities of short-term investments 2,042.5 2,212.0 1,357.3
Purchases of short-term investments (1,040.0) (2,474.6) (1,780.0)
Acquisition of Atwood, net of cash acquired (871.6) 0.0 0.0
Additions to property and equipment (536.7) (322.2) (1,619.5)
Net proceeds from disposition of assets 2.8 9.8 1.6
Net cash used in investing activities of continuing operations (403.0) (575.0) (2,040.6)
FINANCING ACTIVITIES      
Reduction of long-term borrowings (537.0) (863.9) (1,072.5)
Cash dividends paid (13.8) (11.6) (141.2)
Debt financing costs (12.0) (23.4) (10.5)
Proceeds from issuance of senior notes 0.0 849.5 1,078.7
Proceeds from equity issuance 0.0 585.5 0.0
Premium paid on redemption of debt 0.0 0.0 (30.3)
Other (7.7) (7.1) (16.0)
Net cash provided by (used in) financing activities (570.5) 529.0 (191.8)
Net cash provided by (used in) discontinued operations (0.8) 8.4 (8.7)
Effect of exchange rate changes on cash and cash equivalents 0.6 (1.4) (0.3)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (714.3) 1,038.4 (543.5)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 1,159.7 121.3 664.8
CASH AND CASH EQUIVALENTS, END OF YEAR $ 445.4 $ 1,159.7 $ 121.3