Accumulated Other Comprehensive Loss (Reclassifications) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 899,203	$ 837,492	$ 1,814,400	$ 1,633,760
Interest expense, net	(24,346)	(26,446)	(49,504)	(52,329)
Selling, general and administrative	(236,190)	(233,631)	(474,292)	(482,264)
Income (loss) from continuing operations before taxes	25,791	16,719	(15,856)	(211,858)
Income tax provision	(4,915)	(17,016)	9,077	(6,986)
Net loss	19,856	(3,329)	(11,685)	(211,812)
Reclassification out of Accumulated Other Comprehensive Loss | Cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	118	(64)	244	(3)
Cost of sales	(47)	32	(105)	42
Interest expense, net	(96)	0	(96)	0
Income (loss) from continuing operations before taxes	(25)	(32)	43	39
Income tax provision	(6)	(8)	11	10
Net loss	(19)	(24)	32	29
Reclassification out of Accumulated Other Comprehensive Loss | Available for sale securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	1	3,233	0	3,517
Selling, general and administrative	217	0	259	0
Income (loss) from continuing operations before taxes	218	3,233	259	3,517
Income tax provision	55	805	65	876
Net loss	163	2,428	194	2,641
Reclassification out of Accumulated Other Comprehensive Loss | Pension and postretirement benefit plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (loss) from continuing operations before taxes	(13,496)	(14,879)	(26,641)	(26,399)
Income tax provision	(3,303)	(3,502)	(6,511)	(6,152)
Net loss	(10,193)	(11,377)	(20,130)	(20,247)
Reclassification out of Accumulated Other Comprehensive Loss | Transition credit
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension and postretirement benefit plans	0	1	0	2
Reclassification out of Accumulated Other Comprehensive Loss | Prior service costs
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension and postretirement benefit plans	(86)	(138)	(170)	(277)
Reclassification out of Accumulated Other Comprehensive Loss | Actuarial losses
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension and postretirement benefit plans	(13,096)	(10,940)	(26,157)	(21,933)
Reclassification out of Accumulated Other Comprehensive Loss | Settlement
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Pension and postretirement benefit plans	$ (314)	$ (3,802)	$ (314)	$ (4,191)