Consolidated Statements Of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash provided (required) by operating activities:
Net income (loss)	$ (3,237.9)	$ (2,412.1)	$ (1,910.8)
Adjustments to reconcile net income to cash provided (required) by operating activities
Depreciation	323.5	383.5	367.8
Amortization	123.7	126.1	182.6
Employee benefit plan and share-based compensation costs	47.5	63.3	22.4
Deferred income tax provision (benefit), net	(6.7)	(75.4)	48.8
Unrealized loss (gain) on derivative instruments and foreign exchange	(41.2)	32.5	102.7
Impairments (Note 17)	3,287.4	2,484.1	1,792.6
Income from equity affiliates, net of dividends received	(58.1)	(58.8)	(110.7)
Other	195.5	364.4	291.8
Changes in operating assets and liabilities, net of effects of acquisitions
Trade receivables, net and contract assets	348.1	(39.7)	(664.1)
Inventories, net	82.8	(169.6)	(339.4)
Accounts payable, trade	18.4	26.1	(1,248.7)
Contract liabilities	(75.2)	520.1	762.7
Income taxes payable (receivable), net	(52.8)	12.7	(190.7)
Other current assets and liabilities, net	(267.3)	(431.8)	921.2
Other noncurrent assets and liabilities, net	(30.8)	23.1	(213.6)
Cash provided (required) by operating activities	656.9	848.5	(185.4)
Cash required by investing activities
Capital expenditures	(291.8)	(454.4)	(368.1)
Payments to Acquire Investments	(3.9)	(71.6)	0.0
Proceeds from Sale of Debt Securities, Available-for-sale	51.5	18.9	0.0
Payments to Acquire Marketable Securities	(17.9)	0.0	0.0
Acquisitions, net of cash acquired	0.0	16.0	(104.9)
Cash received from (used by) divestitures	(8.8)	2.1	6.7
Proceeds from sale of assets	46.0	7.8	19.5
Proceeds from Collection of Advance to Affiliate	26.7	62.0
Other		3.6	0.0
Cash required by investing activities	(180.6)	(419.8)	(460.2)
Cash required by financing activities
Proceeds from (Repayments of) Short-term Debt less Commercial Paper	(24.4)	(49.6)	(34.9)
Net increase (decrease) in commercial paper	(554.5)	57.3	496.6
Proceeds from issuance of long-term debt	223.2	96.2
Repayments of long-term debt	(423.9)	0.0	0.0
Purchase of ordinary shares		92.7	442.6
Dividends paid	(59.2)	(232.8)	(238.1)
Payments related to taxes withheld on share-based compensation	(7.4)		0.0
Settlements of mandatorily redeemable financial liability	(224.2)	(562.8)	(225.8)
Proceeds from (Payments to) Noncontrolling Interests	11.8	0.0	0.0
Cash required by financing activities	(1,082.2)	(784.4)	(444.8)
Effect of changes in foreign exchange rates on cash and cash equivalents	223.5	5.9	(107.0)
Decrease in cash and cash equivalents	(382.4)	(349.8)	(1,197.4)
Cash and cash equivalents, beginning of year	5,190.2	5,540.0	6,737.4
Cash and cash equivalents, end of year	4,807.8	5,190.2	5,540.0
Supplemental disclosures of cash flow information
Cash paid for interest (net of interest capitalized)	107.0	109.4	99.0
Cash paid for income taxes (net of refunds received)	$ 219.7	$ 374.5	$ 410.6