Other Comprehensive Income (Loss) - Significant Items Reclassified Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassifications out of accumulated other comprehensive income (loss)
Income tax expense (benefit)	$ (31,085)	$ 75,757	$ 35,747	$ 60,500
Interest expense	(17,091)	(18,876)	(35,414)	(37,506)
Net earnings (loss)	(18,262)	(452,700)	(274,712)	(497,745)
Ownership Share of Equity Method Investees’ Other Comprehensive Income (Loss) | Reclassified out of AOCI
Reclassifications out of accumulated other comprehensive income (loss)
Cost of Revenue	(176)	(188)	(364)	(377)
Income tax expense (benefit)	44	47	91	94
Net earnings (loss)	(132)	(141)	(273)	(283)
Defined Benefit Pension and Postretirement Plans | Reclassified out of AOCI
Reclassifications out of accumulated other comprehensive income (loss)
Income tax expense (benefit)	44	143	0	289
Corporate G&A	(998)	(2,182)	(2,000)	(4,392)
Net earnings (loss)	(954)	(2,039)	(2,000)	(4,103)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Reclassified out of AOCI
Reclassifications out of accumulated other comprehensive income (loss)
Income tax expense (benefit)	40	427	36	931
Net earnings (loss)	(619)	(609)	(400)	(1,370)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Reclassified out of AOCI | Commodity and foreign currency contracts
Reclassifications out of accumulated other comprehensive income (loss)
Cost of Revenue	(240)	(617)	402	(1,462)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest | Reclassified out of AOCI | Interest rate contracts
Reclassifications out of accumulated other comprehensive income (loss)
Interest expense	$ (419)	$ (419)	$ (838)	$ (839)