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8. Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	$ (87,348)	$ (46,958)
Other comprehensive income, net of tax	(40,390)	(106,495)	$ 321,028
Foreign currency translation adjustments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(72,400)	(35,500)	77,400
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(36,500)	(112,900)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0	0
Other Comprehensive Income (Loss), Tax	(400)	0
Other comprehensive income, net of tax	(36,900)	(112,900)
Other Postretirement Benefit Plan [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(22,200)	(14,800)	(22,300)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(10,000)	6,900
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,500	2,400
Other Comprehensive Income (Loss), Tax	1,100	(1,800)
Other comprehensive income, net of tax	(7,400)	7,500
Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	7,200	3,300	4,400
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	4,800	(1,400)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(400)	300
Other Comprehensive Income (Loss), Tax	(500)	0
Other comprehensive income, net of tax	3,900	(1,100)
Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive (loss) income	(87,400)	(47,000)	$ 59,500
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(41,700)	(107,400)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1,100	2,700
Other Comprehensive Income (Loss), Tax	200	(1,800)
Other comprehensive income, net of tax	$ (40,400)	$ (106,500)

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Amount of tax expense (benefit) allocated to other comprehensive income (loss).

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