Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
OPERATING ACTIVITIES
Net income	$ 897.1	$ (1,585.9)	$ (3,888.5)
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:
Depreciation expense	445.3	572.5	537.9
(Gain) loss on debt extinguishment	(287.8)	33.5	0.0
Share-based Compensation	39.6	40.2	45.1
Deferred income tax expense (benefit)	28.7	(158.0)	(123.5)
Amortization of assets and liabilities, net	(20.5)	(1.4)	(7.9)
(Income) loss from discontinued operations, net	(8.1)	128.6	1,199.2
Bad debt provision	(5.7)	24.1	(5.0)
Loss on impairment	0.0	2,746.4	4,218.7
Other	(3.0)	(18.1)	(11.4)
Changes in operating assets and liabilities	(8.2)	(84.0)	93.3
Net cash provided by operating activities of continuing operations	1,077.4	1,697.9	2,057.9
INVESTING ACTIVITIES
Purchases of short-term investments	(2,474.6)	(1,780.0)	(790.6)
Maturities of short-term investments	2,212.0	1,357.3	83.3
Additions to property and equipment	(322.2)	(1,619.5)	(1,566.7)
Net proceeds from disposition of assets	9.8	1.6	169.2
Net cash used in investing activities of continuing operations	(575.0)	(2,040.6)	(2,104.8)
FINANCING ACTIVITIES
Reduction of long-term borrowings	(863.9)	(1,072.5)	(60.1)
Proceeds from issuance of senior notes	849.5	1,078.7	1,246.4
Proceeds from equity issuance	585.5	0.0	0.0
Debt financing costs	(23.4)	(10.5)	(13.4)
Cash dividends paid	(11.6)	(141.2)	(703.0)
Premium paid on redemption of debt	0.0	(30.3)	0.0
Other	(7.1)	(16.0)	(27.2)
Net cash provided by (used in) financing activities	529.0	(191.8)	442.7
DISCONTINUED OPERATIONS
Operating activities	2.1	(10.9)	(3.8)
Investing activities	6.3	2.2	107.2
Net Cash Provided by (Used in) Discontinued Operations	8.4	(8.7)	103.4
Effect of exchange rate changes on cash and cash equivalents	(1.4)	(0.3)	0.0
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	1,038.4	(543.5)	499.2
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR	121.3	664.8	165.6
CASH AND CASH EQUIVALENTS, END OF YEAR	$ 1,159.7	$ 121.3	$ 664.8

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The cash inflow from sales, maturities, prepayments, calls and collections of all investments, including securities and other assets, having ready marketability and intended by management to be liquidated, if necessary, within the current operating cycle. Includes cash flows from securities classified as trading securities that were acquired for reasons other than sale in the short-term.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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