Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash provided (required) by operating activities:
Net income	$ 49.2	$ 338.6
Adjustments to reconcile net income to cash provided (required) by operating activities:
Depreciation	130.0	133.6
Amortization	51.1	48.9
Employee benefit plan and stock-based compensation costs	56.0	67.9
Unrealized loss on derivative instruments and foreign exchange contracts	35.9	31.5
Deferred income tax provision (benefit)	(14.2)	30.6
Impairments (Note 5)	40.2	64.4
Other	53.9	34.8
Changes in operating assets and liabilities, net of effects of acquisitions:
Trade receivables, net and costs in excess of billings	240.4	181.3
Inventories, net	127.3	105.2
Accounts payable, trade	(155.7)	(140.6)
Advance payments and billings in excess of costs	(182.9)	(241.3)
Income taxes payable, net	(16.1)	(127.9)
Accrued pension and other post-retirement benefits, net	(67.3)	(20.4)
Other assets and liabilities, net	(112.4)	(5.6)
Cash provided by operating activities from continuing operations	235.4	501.0
Cash required by operating activities from discontinued operations (Note 6)	(8.1)
Cash provided by operating activities	227.3	501.0
Cash provided (required) by investing activities:
Capital expenditures	(93.1)	(211.0)
Investments in joint ventures	(52.9)	(5.0)
Proceeds from sale of wireline assets	19.0
Other	6.8	4.3
Cash required by investing activities	(120.2)	(211.7)
Cash provided (required) by financing activities:
Net increase in short-term debt	4.0	1.5
Net increase (decrease) in commercial paper	110.5	(8.0)
Repayments of long-term debt	18.9	1.2
Purchase of treasury stock	(54.8)	(148.0)
Acquisitions, payment of withheld purchase price		(9.6)
Payments related to taxes withheld on stock-based compensation	(8.6)	(8.8)
Other	(2.8)	(7.4)
Cash provided (required) by financing activities	29.4	(181.5)
Effect of exchange rate changes on cash and cash equivalents	21.5	(35.1)
Increase in cash and cash equivalents	158.0	72.7
Cash and cash equivalents, beginning of period	916.2	638.8
Cash and cash equivalents, end of period	$ 1,074.2	$ 711.5