Accumulated Other Comprehensive Loss - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenue	$ 831,343	$ 790,125	$ 788,573	$ 795,084	$ 857,414	$ 760,281	$ 773,538	$ 820,289	$ 3,205,125	$ 3,211,522	$ 2,784,007
Interest expense									(110,910)	(115,381)	(117,984)
Tax provision (benefit)	(344)	24,895	(3,724)	(7,820)	10,819	2,468	(2,205)	(17,498)	13,007	(6,416)	(13,659)
Net of tax	$ 176,696	$ (3,125)	$ 23,697	$ (2,659)	$ 49,969	$ 80,277	$ 51,595	$ 59,970	194,609	241,811	243,528
Selling, general and administrative									(1,003,989)	(1,002,935)	(1,029,494)
Amounts Reclassified from AOCI | Cash flow hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Revenue									72	11	(179)
Cost of sales									104	51	(32)
Interest expense									0	(1,183)	(2,028)
Loss on extinguishment of debt									0	(1,267)	0
Total before tax									176	(2,388)	(2,239)
Tax provision (benefit)									44	(941)	(872)
Net of tax									132	(1,447)	(1,367)
Amounts Reclassified from AOCI | Available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Interest expense									1,079	3,244	(520)
Tax provision (benefit)									270	821	(201)
Net of tax									809	2,423	(319)
Amounts Reclassified from AOCI | Pension and postretirement benefit plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Tax provision (benefit)									(9,497)	(21,675)	(13,936)
Net of tax									(28,288)	(64,999)	(26,828)
Amounts Reclassified from AOCI | Transition asset
Accumulated Other Comprehensive Income (Loss) [Line Items]
Selling, general and administrative									6	7	8
Amounts Reclassified from AOCI | Prior service costs
Accumulated Other Comprehensive Income (Loss) [Line Items]
Selling, general and administrative									(504)	(173)	(166)
Amounts Reclassified from AOCI | Actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Selling, general and administrative									(34,509)	(41,610)	(40,606)
Amounts Reclassified from AOCI | Settlement
Accumulated Other Comprehensive Income (Loss) [Line Items]
Selling, general and administrative									(2,778)	(44,898)	0
Amounts Reclassified from AOCI | Total before tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total before tax									$ (37,785)	$ (86,674)	$ (40,764)