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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES      
Net income (loss) $ (636.6) $ (304.2) $ 897.1
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities of continuing operations:      
Depreciation expense 478.9 444.8 445.3
Deferred income tax expense (benefit) 56.6 55.0 28.7
Share-based compensation expense 41.6 41.2 39.6
Loss on impairment 40.3 182.9 0.0
Amortization (40.2) (61.6) (139.7)
(Gain) loss on debt extinguishment 19.0 2.6 (287.8)
Discontinued operations, net 8.1 (1.0) (8.1)
Bargain purchase gain (1.8) (140.2) 0.0
Other (3.6) (25.5) (38.3)
Changes in operating assets and liabilities, net of acquisition (18.0) 65.4 140.6
Net cash provided by operating activities of continuing operations (55.7) 259.4 1,077.4
INVESTING ACTIVITIES      
Maturities of short-term investments 1,030.0 2,042.5 2,212.0
Purchases of short-term investments (919.0) (1,040.0) (2,474.6)
Additions to property and equipment (426.7) (536.7) (322.2)
Net proceeds from disposition of assets 11.0 2.8 9.8
Acquisition of Atwood, net of cash acquired 0.0 (871.6) 0.0
Net cash used in investing activities of continuing operations (304.7) (403.0) (575.0)
FINANCING ACTIVITIES      
Proceeds from issuance of senior notes 1,000.0 0.0 849.5
Reduction of long-term borrowings (771.2) (537.0) (863.9)
Cash dividends paid (17.9) (13.8) (11.6)
Debt financing costs (17.0) (12.0) (23.4)
Proceeds from equity issuance 0.0 0.0 585.5
Other (5.7) (7.7) (7.1)
Net cash provided by (used in) financing activities 188.2 (570.5) 529.0
Net cash provided by (used in) discontinued operations 2.5 (0.8) 8.4
Effect of exchange rate changes on cash and cash equivalents (0.6) 0.6 (1.4)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (170.3) (714.3) 1,038.4
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 445.4 1,159.7 121.3
CASH AND CASH EQUIVALENTS, END OF YEAR $ 275.1 $ 445.4 $ 1,159.7