Other Comprehensive Income (Loss) - (Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss (gain) on sale of businesses - net									$ (9,273)	$ 22,298	$ (18,070)
Other (income) expense - net									2,394	(1,731)	3,009
Interest expense									44,889	45,616	41,636
Total before tax									(455,273)	(368,512)	(392,345)
Provision for income taxes									118,016	97,403	109,538
Total net of tax	$ (93,746)	$ (83,768)	$ (83,844)	$ (75,899)	$ (57,347)	$ (69,873)	$ (75,759)	$ (68,130)	(337,257)	(271,109)	(282,807)
Reclassification out of Accumulated Other Comprehensive Income | Foreign Currency Translation
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss (gain) on sale of businesses - net									2,749	14,257	(4,725)
Total before tax									2,749	14,257	(4,725)
Provision for income taxes									0	0	0
Total net of tax									2,749	14,257	(4,725)
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Postretirement Plans
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									3,814	7,083	4,939
Provision for income taxes									(589)	(2,896)	(1,431)
Total net of tax									3,225	4,187	3,508
Reclassification out of Accumulated Other Comprehensive Income | Amortization of service cost
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense - net									3,580	3,529	4,939
Reclassification out of Accumulated Other Comprehensive Income | Recognition of settlement loss
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other (income) expense - net									234	3,554	0
Reclassification out of Accumulated Other Comprehensive Income | Derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									6,655	6,851	7,030
Total before tax									6,655	6,851	7,030
Provision for income taxes									(2,445)	(2,490)	(2,499)
Total net of tax									$ 4,210	$ 4,361	$ 4,531