Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash Flows from Operating Activities
Net Income	$ 327,879,000	$ 271,408,000	$ 302,489,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, amortization and goodwill and other long-lived asset impairment	121,648,000	112,245,000	113,310,000
Amortization of lease right-of-use asset	84,185,000	0	0
Net pension benefit, settlement, early retirement and special separation benefit expense	(137,909,000)	(100,948,000)	(57,214,000)
(Gain) loss on marketable equity securities and cost method investments, net	(103,748,000)	4,180,000	0
Provision for doubtful trade and other receivables	22,726,000	10,209,000	33,830,000
Stock-based compensation expense, net	6,278,000	6,412,000	10,169,000
Debt extinguishment costs	0	10,563,000	0
Foreign exchange loss (gain)	1,070,000	3,844,000	(3,310,000)
Net loss (gain) on sales and disposition of businesses	1,936,000	(8,157,000)	569,000
Net (gain) loss on sales or write-downs of an equity affiliate and cost method investments	(29,262,000)	(148,000)	200,000
Gain on sale of an equity affiliate	(28,994,000)	0	0
Equity in (earnings) losses of affiliates, net of distributions	(2,678,000)	(10,606,000)	3,646,000
Provision for (benefit from) deferred income taxes	69,751,000	(7,123,000)	(146,452,000)
Net (gain) loss on sales or write-downs of property, plant and equipment	(1,020,000)	(1,642,000)	413,000
Change in operating assets and liabilities:
Accounts receivable, net	(53,602,000)	49,638,000	(22,744,000)
Inventories	(5,317,000)	(7,351,000)	(541,000)
Accounts payable and accrued liabilities	(47,069,000)	(44,892,000)	19,380,000
Deferred revenue	30,487,000	14,801,000	13,903,000
Income taxes receivable/payable	1,828,000	9,405,000	24,739,000
Other assets and other liabilities, net	(122,252,000)	(26,973,000)	(25,469,000)
Other	233,000	2,154,000	1,137,000
Net Cash Provided by Operating Activities	165,164,000	287,019,000	268,055,000
Cash Flows from Investing Activities
Investments in certain businesses, net of cash acquired	(179,421,000)	(111,546,000)	(299,938,000)
Purchases of property, plant and equipment	(93,504,000)	(98,192,000)	(60,358,000)
Proceeds from sales of marketable equity securities	19,303,000	66,741,000	0
Purchases of marketable equity securities	(7,499,000)	(42,659,000)	0
Loans to related party and affiliate and advance related to Kaplan University transaction	(3,500,000)	(28,061,000)	(6,771,000)
Investments in equity affiliates, cost method and other investments	(27,529,000)	(11,702,000)	(82,944,000)
Net proceeds (payments) from sales of businesses, property, plant and equipment and other assets	54,495,000	(10,344,000)	3,265,000
Return of investment in equity affiliates	920,000	4,799,000	4,727,000
Net Cash Used in Investing Activities	(236,735,000)	(230,964,000)	(442,019,000)
Cash Flows from Financing Activities
Repayments of borrowings and early redemption premium	(8,702,000)	(417,159,000)	(7,715,000)
Issuance of borrowings	41,250,000	400,000,000	0
Net proceeds from vehicle floor plan payable	14,384,000	0	0
Common shares repurchased	(2,103,000)	(118,030,000)	(50,770,000)
Dividends paid	(29,553,000)	(28,617,000)	(28,329,000)
Purchase of noncontrolling interest and deferred payment of acquisition	(2,805,000)	(16,500,000)	(5,187,000)
Payments of financing costs	(33,000)	(6,501,000)	0
Repayments of bank overdrafts	(185,000)	(5,717,000)	(9,505,000)
Issuance of noncontrolling interest	6,000,000	0	0
Other	481,000	165,000	1,400,000
Net Cash Provided by (Used in) Financing Activities	18,734,000	(192,359,000)	(100,106,000)
Effect of Currency Exchange Rate Change	2,766,000	(7,147,000)	10,820,000
Net Decrease in Cash and Cash Equivalents and Restricted Cash	(50,071,000)	(143,451,000)	(263,250,000)
Cash and Cash Equivalents and Restricted Cash at Beginning of Year	264,115,000	407,566,000	670,816,000
Cash and Cash Equivalents and Restricted Cash at End of Year	214,044,000	264,115,000	407,566,000
Cash paid during the year for:
Income taxes	28,000,000	54,000,000	4,000,000
Interest	$ 30,000,000	$ 42,000,000	$ 33,000,000