Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Statement of Cash Flows [Abstract]
Cash and cash equivalents at beginning of year	$ 2,269,756	$ 213,734
Cash flows from operating activities:
Net income	306,539	70,491
Adjustments to reconcile net income to cash flows from operating activities:
Depreciation and amortization	144,087	176,499
Gain on acquisition	(6,025)	0
Gain on sales of businesses, net	0	(122,298)
Stock-based compensation	15,595	13,818
Equity in net income of unconsolidated investments (net of tax)	(55,263)	(46,224)
Dividends received from unconsolidated investments and nonmarketable securities	11,900	34,982
Pension and postretirement expense	67	7,911
Pension and postretirement contributions	(9,607)	(13,649)
Unrealized gain on investments in marketable securities	(2,007)	(3,281)
Loss on early extinguishment of debt	52,801	0
Deferred income taxes	4,677	404,728
Working capital changes	(398,913)	(79,684)
Other, net	10,993	10,821
Net cash provided by operating activities	74,844	454,114
Cash flows from investing activities:
Acquisitions, net of cash acquired	(45,406)	0
Cash payments related to acquisitions and other	0	(81,988)
Capital expenditures	(187,519)	(141,301)
Cash proceeds from divestitures, net	6,857	310,599
Sales of marketable securities, net	450	822
Repayments from joint ventures	1,250	0
Net cash (used in) provided by investing activities	(224,368)	88,132
Cash flows from financing activities:
Repayments of long-term debt	(753,209)	(382,730)
Proceeds from borrowings of long-term debt	27,000	0
Other borrowings (repayments), net	79,203	(9,026)
Fees related to early extinguishment of debt	(46,959)	0
Dividends paid to shareholders	(105,205)	(101,061)
Dividends paid to noncontrolling interests	(27,791)	(23,873)
Repurchases of common stock	(250,000)	0
Proceeds from exercise of stock options	7,011	6,779
Withholding taxes paid on stock-based compensation award distributions	(8,317)	(2,008)
Net cash used in financing activities	(1,078,267)	(511,919)
Net effect of foreign exchange on cash and cash equivalents	3,374	(10,462)
(Decrease) increase in cash and cash equivalents	(1,224,417)	19,865
Cash and cash equivalents at end of period	$ 1,045,339	$ 233,599