Other Comprehensive Income (Loss) - Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Loss (gain) on sale of businesses - net									$ 0	$ (9,273)	$ 22,298
Other (income) expense - net									(3,985)	2,394	(1,731)
Interest expense									44,134	44,889	45,616
Total before tax									(528,939)	(455,273)	(368,512)
Provision for income taxes									118,366	118,016	97,403
Total net of tax	$ (98,137)	$ (106,352)	$ (107,126)	$ (98,958)	$ (93,746)	$ (83,768)	$ (83,844)	$ (75,899)	(410,573)	(337,257)	(271,109)
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									0	2,749	14,257
Total before tax									0	2,749	14,257
Provision for income taxes									0	0	0
Total net of tax									0	2,749	14,257
Reclassification out of Accumulated Other Comprehensive Income | Retirement Benefits Adjustments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total before tax									2,938	3,814	7,083
Provision for income taxes									(701)	(589)	(2,896)
Total net of tax									2,237	3,225	4,187
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									3,246	3,580	3,529
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									(308)	234	3,554
Reclassification out of Accumulated Other Comprehensive Income | Cumulative Unrealized Gain (Loss) on Derivatives
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest expense									6,475	6,655	6,851
Total before tax									6,475	6,655	6,851
Provision for income taxes									(1,469)	(2,445)	(2,490)
Total net of tax									$ 5,006	$ 4,210	$ 4,361