Litigation, Claims, Contingencies and Other - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) Agreement	Sep. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Environmental remediation liability	$ 2,300,000		$ 2,300,000
Maximum potential amount of future payments	17,300,000		$ 17,300,000
Guarantees relate to facilities leased by the company			2027-10
Recourse provision to recover guarantees	0		$ 0
Bargaining agreements | Agreement			100
Self insurance reserve	18,900,000		$ 18,900,000
Workers' compensation liability	13,700,000		13,700,000
Self insurance reserve for general and auto	5,200,000		5,200,000
Self insurance reserve on discontinued operations	2,700,000		2,700,000
Estimated employee health benefit claims incurred but not yet reported	1,700,000		1,700,000
Payments for self insurance	1,400,000	$ 1,300,000	4,100,000	$ 3,800,000
Self insurance reserve in which company is the primary obligor	10,400,000		10,400,000
Self insurance reserve in which company is the primary obligor for workers compensation	6,900,000		6,900,000
Self insurance reserve in which company is the primary obligor for general liability	3,500,000		3,500,000
Minimum
Loss Contingencies [Line Items]
General range on claims	200,000		200,000
Maximum
Loss Contingencies [Line Items]
General range on claims	$ 500,000		$ 500,000