Inventories Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Inventory Disclosure [Abstract]
Inventory Valuation Reserves	$ 97,500,000	$ 70,800,000
LIFO inventory amount	387,200,000	300,900,000
Replacement costs over stated LIFO value	7,900,000	$ 600,000
Effect of LIFO inventory liquidation on income	$ 0