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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
OPERATING ACTIVITIES      
Net income $ (1,585.9) $ (3,888.5) $ 1,427.9
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:      
Asset Impairment Charges 2,746.4 4,218.7 0.0
Cost of Services, Depreciation 572.5 537.9 496.2
Deferred income tax expense (benefit) (158.0) (123.5) 10.1
Discontinued operations, net 128.6 1,199.2 2.2
Share-based compensation expense 40.2 45.1 50.3
Gains (Losses) on Extinguishment of Debt 33.5 0.0 0.0
Provision for Doubtful Accounts 24.1 (5.0) 11.7
Amortization of intangibles and other, net (1.4) (7.9) (28.4)
Other (18.1) (11.4) (7.7)
Changes in operating assets and liabilities (84.0) 93.3 (151.1)
Net cash provided by operating activities of continuing operations 1,697.9 2,057.9 1,811.2
INVESTING ACTIVITIES      
Purchases of short-term investments (1,780.0) (790.6) (50.0)
Additions to property and equipment (1,619.5) (1,566.7) (1,763.5)
Maturities of short-term investments 1,357.3 83.3 50.0
Proceeds from Sale of Property, Plant, and Equipment 1.6 169.2 6.0
Net cash used in investing activities of continuing operations (2,040.6) (2,104.8) (1,757.5)
FINANCING ACTIVITIES      
Proceeds from issuance of senior notes 1,078.7 1,246.4 0.0
Reduction of long-term borrowings (1,072.5) (60.1) (47.5)
Cash dividends paid (141.2) (703.0) (525.6)
Equity financing costs (30.3) 0.0 0.0
Debt financing costs (10.5) (13.4) (4.6)
Proceeds from exercise of share options 0.3 2.6 22.3
Other (16.3) (29.8) (21.7)
Net cash (used in) provided by financing activities of continuing operations (191.8) 442.7 (577.1)
DISCONTINUED OPERATIONS      
Operating activities (10.9) (3.8) 169.3
Investing activities 2.2 107.2 32.8
Net Cash Provided by (Used in) Discontinued Operations (8.7) 103.4 202.1
Effect of exchange rate changes on cash and cash equivalents (0.3) 0.0 (0.2)
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS (543.5) 499.2 (321.5)
CASH AND CASH EQUIVALENTS, BEGINNING OF YEAR 664.8 165.6 487.1
CASH AND CASH EQUIVALENTS, END OF YEAR $ 121.3 $ 664.8 $ 165.6